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cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">個人用ツール</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="利用者メニュー" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=ja.wikipedia.org&uselang=ja"><span>寄付</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:%E3%82%A2%E3%82%AB%E3%82%A6%E3%83%B3%E3%83%88%E4%BD%9C%E6%88%90&returnto=%E6%B5%AE%E5%8A%9B" title="アカウントを作成してログインすることをお勧めしますが、必須ではありません"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>アカウント作成</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:%E3%83%AD%E3%82%B0%E3%82%A4%E3%83%B3&returnto=%E6%B5%AE%E5%8A%9B" title="ログインすることを推奨します。ただし、必須ではありません。 [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>ログイン</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> ログアウトした編集者のページ <a href="/wiki/Wikipedia:%E3%82%A6%E3%82%A3%E3%82%AD%E3%83%9A%E3%83%87%E3%82%A3%E3%82%A2%E3%81%B8%E3%82%88%E3%81%86%E3%81%93%E3%81%9D" aria-label="編集の詳細"><span>もっと詳しく</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E8%87%AA%E5%88%86%E3%81%AE%E6%8A%95%E7%A8%BF%E8%A8%98%E9%8C%B2" title="このIPアドレスからなされた編集の一覧 [y]" accesskey="y"><span>投稿記録</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E3%83%88%E3%83%BC%E3%82%AF%E3%83%9A%E3%83%BC%E3%82%B8" title="このIPアドレスからなされた編集についての議論 [n]" accesskey="n"><span>トーク</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="サイト"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="目次" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">目次</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">非表示</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">ページ先頭</div> </a> </li> <li id="toc-定式化" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#定式化"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>定式化</span> </div> </a> <ul id="toc-定式化-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-無次元数" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#無次元数"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>無次元数</span> </div> </a> <ul id="toc-無次元数-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-関連項目" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#関連項目"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>関連項目</span> </div> </a> <ul id="toc-関連項目-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="目次" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="目次" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="目次の表示・非表示を切り替え" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">目次の表示・非表示を切り替え</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">浮力</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="特定の記事の別の言語版に移動します。利用可能な言語63件" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-63" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">63の言語版</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Dryfvermo%C3%AB" title="アフリカーンス語: Dryfvermoë" lang="af" hreflang="af" data-title="Dryfvermoë" data-language-autonym="Afrikaans" data-language-local-name="アフリカーンス語" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B7%D9%81%D9%88" title="アラビア語: طفو" lang="ar" hreflang="ar" data-title="طفو" data-language-autonym="العربية" data-language-local-name="アラビア語" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Flotabilid%C3%A1" title="アストゥリアス語: Flotabilidá" lang="ast" hreflang="ast" data-title="Flotabilidá" data-language-autonym="Asturianu" data-language-local-name="アストゥリアス語" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Batmazl%C4%B1q" title="アゼルバイジャン語: Batmazlıq" lang="az" hreflang="az" data-title="Batmazlıq" data-language-autonym="Azərbaycanca" data-language-local-name="アゼルバイジャン語" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%A8%D8%A7%D8%AA%D9%85%D8%A7%D8%B2%D9%84%DB%8C%D9%82" title="South Azerbaijani: باتمازلیق" lang="azb" hreflang="azb" data-title="باتمازلیق" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9F%D0%BB%D1%8B%D0%B2%D1%83%D1%87%D0%B0%D1%81%D1%86%D1%8C" title="ベラルーシ語: Плывучасць" lang="be" hreflang="be" data-title="Плывучасць" data-language-autonym="Беларуская" data-language-local-name="ベラルーシ語" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9F%D0%BB%D0%B0%D0%B2%D0%B0%D0%B5%D0%BC%D0%BE%D1%81%D1%82" title="ブルガリア語: Плаваемост" lang="bg" hreflang="bg" data-title="Плаваемост" data-language-autonym="Български" data-language-local-name="ブルガリア語" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AA%E0%A7%8D%E0%A6%B2%E0%A6%AC%E0%A6%A4%E0%A6%BE" title="ベンガル語: প্লবতা" lang="bn" hreflang="bn" data-title="প্লবতা" data-language-autonym="বাংলা" data-language-local-name="ベンガル語" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Potisak" title="ボスニア語: Potisak" lang="bs" hreflang="bs" data-title="Potisak" data-language-autonym="Bosanski" data-language-local-name="ボスニア語" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Flotabilitat" title="カタロニア語: Flotabilitat" lang="ca" hreflang="ca" data-title="Flotabilitat" data-language-autonym="Català" data-language-local-name="カタロニア語" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Vztlak" title="チェコ語: Vztlak" lang="cs" hreflang="cs" data-title="Vztlak" data-language-autonym="Čeština" data-language-local-name="チェコ語" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Opdrift_(statisk)" title="デンマーク語: Opdrift (statisk)" lang="da" hreflang="da" data-title="Opdrift (statisk)" data-language-autonym="Dansk" data-language-local-name="デンマーク語" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Statischer_Auftrieb" title="ドイツ語: Statischer Auftrieb" lang="de" hreflang="de" data-title="Statischer Auftrieb" data-language-autonym="Deutsch" data-language-local-name="ドイツ語" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%86%CE%BD%CF%89%CF%83%CE%B7" title="ギリシャ語: Άνωση" lang="el" hreflang="el" data-title="Άνωση" data-language-autonym="Ελληνικά" data-language-local-name="ギリシャ語" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Buoyancy" title="英語: Buoyancy" lang="en" hreflang="en" data-title="Buoyancy" data-language-autonym="English" data-language-local-name="英語" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Flotabilidad" title="スペイン語: Flotabilidad" lang="es" hreflang="es" data-title="Flotabilidad" data-language-autonym="Español" data-language-local-name="スペイン語" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/%C3%9Clesl%C3%BCkkej%C3%B5ud" title="エストニア語: Üleslükkejõud" lang="et" hreflang="et" data-title="Üleslükkejõud" data-language-autonym="Eesti" data-language-local-name="エストニア語" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Flotagarritasun" title="バスク語: Flotagarritasun" lang="eu" hreflang="eu" data-title="Flotagarritasun" data-language-autonym="Euskara" data-language-local-name="バスク語" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B4%D9%86%D8%A7%D9%88%D8%B1%DB%8C" title="ペルシア語: شناوری" lang="fa" hreflang="fa" data-title="شناوری" data-language-autonym="فارسی" data-language-local-name="ペルシア語" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Noste" title="フィンランド語: Noste" lang="fi" hreflang="fi" data-title="Noste" data-language-autonym="Suomi" data-language-local-name="フィンランド語" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Flottabilit%C3%A9" title="フランス語: Flottabilité" lang="fr" hreflang="fr" data-title="Flottabilité" data-language-autonym="Français" data-language-local-name="フランス語" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Buacacht" title="アイルランド語: Buacacht" lang="ga" hreflang="ga" data-title="Buacacht" data-language-autonym="Gaeilge" data-language-local-name="アイルランド語" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Flotabilidade" title="ガリシア語: Flotabilidade" lang="gl" hreflang="gl" data-title="Flotabilidade" data-language-autonym="Galego" data-language-local-name="ガリシア語" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A6%D7%99%D7%A4%D7%94_(%D7%A4%D7%99%D7%96%D7%99%D7%A7%D7%94)" title="ヘブライ語: ציפה (פיזיקה)" lang="he" hreflang="he" data-title="ציפה (פיזיקה)" data-language-autonym="עברית" data-language-local-name="ヘブライ語" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%89%E0%A4%A4%E0%A5%8D%E0%A4%AA%E0%A5%8D%E0%A4%B2%E0%A4%BE%E0%A4%B5%E0%A4%A8_%E0%A4%AC%E0%A4%B2" title="ヒンディー語: उत्प्लावन बल" lang="hi" hreflang="hi" data-title="उत्प्लावन बल" data-language-autonym="हिन्दी" data-language-local-name="ヒンディー語" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Uzgon" title="クロアチア語: Uzgon" lang="hr" hreflang="hr" data-title="Uzgon" data-language-autonym="Hrvatski" data-language-local-name="クロアチア語" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Flotabilite" title="ハイチ・クレオール語: Flotabilite" lang="ht" hreflang="ht" data-title="Flotabilite" data-language-autonym="Kreyòl ayisyen" data-language-local-name="ハイチ・クレオール語" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Felhajt%C3%B3er%C5%91_(hidrosztatika)" title="ハンガリー語: Felhajtóerő (hidrosztatika)" lang="hu" hreflang="hu" data-title="Felhajtóerő (hidrosztatika)" data-language-autonym="Magyar" data-language-local-name="ハンガリー語" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Gaya_apung" title="インドネシア語: Gaya apung" lang="id" hreflang="id" data-title="Gaya apung" data-language-autonym="Bahasa Indonesia" data-language-local-name="インドネシア語" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Uppdrif" title="アイスランド語: Uppdrif" lang="is" hreflang="is" data-title="Uppdrif" data-language-autonym="Íslenska" data-language-local-name="アイスランド語" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%B6%80%EB%A0%A5" title="韓国語: 부력" lang="ko" hreflang="ko" data-title="부력" data-language-autonym="한국어" data-language-local-name="韓国語" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lo mw-list-item"><a href="https://lo.wikipedia.org/wiki/%E0%BA%81%E0%BA%B2%E0%BA%99%E0%BA%A5%E0%BA%AD%E0%BA%8D%E0%BA%95%E0%BA%BB%E0%BA%A7" title="ラオ語: ການລອຍຕົວ" lang="lo" hreflang="lo" data-title="ການລອຍຕົວ" data-language-autonym="ລາວ" data-language-local-name="ラオ語" class="interlanguage-link-target"><span>ລາວ</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%AA%E0%B5%8D%E0%B4%B2%E0%B4%B5%E0%B4%95%E0%B5%8D%E0%B4%B7%E0%B4%AE%E0%B4%AC%E0%B4%B2%E0%B4%82" title="マラヤーラム語: പ്ലവക്ഷമബലം" lang="ml" hreflang="ml" data-title="പ്ലവക്ഷമബലം" data-language-autonym="മലയാളം" data-language-local-name="マラヤーラム語" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Keapungan" title="マレー語: Keapungan" lang="ms" hreflang="ms" data-title="Keapungan" data-language-autonym="Bahasa Melayu" data-language-local-name="マレー語" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%96%E1%80%B1%E1%80%AC%E1%80%B7%E1%80%82%E1%80%AF%E1%80%8F%E1%80%BA" title="ミャンマー語: ဖော့ဂုဏ်" lang="my" hreflang="my" data-title="ဖော့ဂုဏ်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="ミャンマー語" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%89%E0%A4%B0%E0%A5%8D%E0%A4%A7%E0%A5%8D%E0%A4%B5%E0%A4%9A%E0%A4%BE%E0%A4%AA" title="ネパール語: उर्ध्वचाप" lang="ne" hreflang="ne" data-title="उर्ध्वचाप" data-language-autonym="नेपाली" data-language-local-name="ネパール語" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-nl badge-Q70894304 mw-list-item" title=""><a href="https://nl.wikipedia.org/wiki/Drijfkracht" title="オランダ語: Drijfkracht" lang="nl" hreflang="nl" data-title="Drijfkracht" data-language-autonym="Nederlands" data-language-local-name="オランダ語" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Oppdrift" title="ノルウェー語(ニーノシュク): Oppdrift" lang="nn" hreflang="nn" data-title="Oppdrift" data-language-autonym="Norsk nynorsk" data-language-local-name="ノルウェー語(ニーノシュク)" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Oppdrift" title="ノルウェー語(ブークモール): Oppdrift" lang="nb" hreflang="nb" data-title="Oppdrift" data-language-autonym="Norsk bokmål" data-language-local-name="ノルウェー語(ブークモール)" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%89%E0%A8%A4%E0%A8%AA%E0%A8%B2%E0%A8%BE%E0%A8%B5%E0%A8%A8_%E0%A8%AC%E0%A8%B2" title="パンジャブ語: ਉਤਪਲਾਵਨ ਬਲ" lang="pa" hreflang="pa" data-title="ਉਤਪਲਾਵਨ ਬਲ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="パンジャブ語" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Si%C5%82a_wyporu" title="ポーランド語: Siła wyporu" lang="pl" hreflang="pl" data-title="Siła wyporu" data-language-autonym="Polski" data-language-local-name="ポーランド語" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Impuls%C3%A3o" title="ポルトガル語: Impulsão" lang="pt" hreflang="pt" data-title="Impulsão" data-language-autonym="Português" data-language-local-name="ポルトガル語" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Flotabilitate" title="ルーマニア語: Flotabilitate" lang="ro" hreflang="ro" data-title="Flotabilitate" data-language-autonym="Română" data-language-local-name="ルーマニア語" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D0%BB%D0%B0%D0%B2%D1%83%D1%87%D0%B5%D1%81%D1%82%D1%8C" title="ロシア語: Плавучесть" lang="ru" hreflang="ru" data-title="Плавучесть" data-language-autonym="Русский" data-language-local-name="ロシア語" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Uzgon" title="セルボ・クロアチア語: Uzgon" lang="sh" hreflang="sh" data-title="Uzgon" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="セルボ・クロアチア語" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%8B%E0%B6%AD%E0%B7%8A%E0%B6%B4%E0%B7%8A%E0%B6%BD%E0%B7%8F%E0%B7%80%E0%B6%9A%E0%B6%AD%E0%B7%8F%E0%B7%80" title="シンハラ語: උත්ප්ලාවකතාව" lang="si" hreflang="si" data-title="උත්ප්ලාවකතාව" data-language-autonym="සිංහල" data-language-local-name="シンハラ語" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Buoyancy" title="シンプル英語: Buoyancy" lang="en-simple" hreflang="en-simple" data-title="Buoyancy" data-language-autonym="Simple English" data-language-local-name="シンプル英語" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Vzgon" title="スロベニア語: Vzgon" lang="sl" hreflang="sl" data-title="Vzgon" data-language-autonym="Slovenščina" data-language-local-name="スロベニア語" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sn mw-list-item"><a href="https://sn.wikipedia.org/wiki/Simudzo" title="ショナ語: Simudzo" lang="sn" hreflang="sn" data-title="Simudzo" data-language-autonym="ChiShona" data-language-local-name="ショナ語" class="interlanguage-link-target"><span>ChiShona</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Pluskueshm%C3%ABria" title="アルバニア語: Pluskueshmëria" lang="sq" hreflang="sq" data-title="Pluskueshmëria" data-language-autonym="Shqip" data-language-local-name="アルバニア語" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%A3%D0%B7%D0%B3%D0%BE%D0%BD" title="セルビア語: Узгон" lang="sr" hreflang="sr" data-title="Узгон" data-language-autonym="Српски / srpski" data-language-local-name="セルビア語" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Flytkraft" title="スウェーデン語: Flytkraft" lang="sv" hreflang="sv" data-title="Flytkraft" data-language-autonym="Svenska" data-language-local-name="スウェーデン語" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%AE%E0%AF%87%E0%AE%B2%E0%AF%81%E0%AE%A4%E0%AF%88%E0%AE%AA%E0%AF%8D%E0%AE%AA%E0%AF%81" title="タミル語: மேலுதைப்பு" lang="ta" hreflang="ta" data-title="மேலுதைப்பு" data-language-autonym="தமிழ்" data-language-local-name="タミル語" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%81%E0%B8%A3%E0%B8%87%E0%B8%A5%E0%B8%AD%E0%B8%A2%E0%B8%95%E0%B8%B1%E0%B8%A7" title="タイ語: แรงลอยตัว" lang="th" hreflang="th" data-title="แรงลอยตัว" data-language-autonym="ไทย" data-language-local-name="タイ語" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Batmazl%C4%B1k" title="トルコ語: Batmazlık" lang="tr" hreflang="tr" data-title="Batmazlık" data-language-autonym="Türkçe" data-language-local-name="トルコ語" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-ug mw-list-item"><a href="https://ug.wikipedia.org/wiki/%D9%84%DB%95%D9%8A%D9%84%D9%89%D8%AA%D9%89%D8%B4_%D9%83%DB%88%DA%86%D9%89" title="ウイグル語: لەيلىتىش كۈچى" lang="ug" hreflang="ug" data-title="لەيلىتىش كۈچى" data-language-autonym="ئۇيغۇرچە / Uyghurche" data-language-local-name="ウイグル語" class="interlanguage-link-target"><span>ئۇيغۇرچە / Uyghurche</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D0%BB%D0%B0%D0%B2%D1%83%D1%87%D1%96%D1%81%D1%82%D1%8C" title="ウクライナ語: Плавучість" lang="uk" hreflang="uk" data-title="Плавучість" data-language-autonym="Українська" data-language-local-name="ウクライナ語" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D9%82%D9%88%D8%AA_%D8%A7%DA%86%DA%BE%D8%A7%D9%84" title="ウルドゥー語: قوت اچھال" lang="ur" hreflang="ur" data-title="قوت اچھال" data-language-autonym="اردو" data-language-local-name="ウルドゥー語" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/L%E1%BB%B1c_n%E1%BB%95i" title="ベトナム語: Lực nổi" lang="vi" hreflang="vi" data-title="Lực nổi" data-language-autonym="Tiếng Việt" data-language-local-name="ベトナム語" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E6%B5%AE%E5%8A%9B" title="呉語: 浮力" lang="wuu" hreflang="wuu" data-title="浮力" data-language-autonym="吴语" data-language-local-name="呉語" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E6%B5%AE%E5%8A%9B" title="中国語: 浮力" lang="zh" hreflang="zh" data-title="浮力" data-language-autonym="中文" data-language-local-name="中国語" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Ph%C3%BB-le%CC%8Dk" title="閩南語: Phû-le̍k" lang="nan" hreflang="nan" data-title="Phû-le̍k" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="閩南語" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E6%B5%AE%E5%8A%9B" title="広東語: 浮力" lang="yue" hreflang="yue" data-title="浮力" data-language-autonym="粵語" data-language-local-name="広東語" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q6497624#sitelinks-wikipedia" title="言語間リンクを編集" class="wbc-editpage">リンクを編集</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="名前空間"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet 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</div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="ページツール"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="表示"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">表示</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" 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.ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%;font-size:90%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox 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href="//www.google.co.jp/search?hl=ja&as_eq=wikipedia&q=%22%E6%B5%AE%E5%8A%9B%22&num=50">"浮力"</a> – <a rel="nofollow" class="external text" href="//www.google.co.jp/search?hl=ja&q=%22%E6%B5%AE%E5%8A%9B%22&tbm=nws">ニュース</a> <b>·</b> <a rel="nofollow" class="external text" href="//www.google.co.jp/search?hl=ja&tbs=bks:1&q=%22%E6%B5%AE%E5%8A%9B%22">書籍</a> <b>·</b> <a rel="nofollow" class="external text" href="//scholar.google.co.jp/scholar?num=100&hl=ja&q=%22%E6%B5%AE%E5%8A%9B%22">スカラー</a> <b>·</b> <a rel="nofollow" class="external text" href="https://ci.nii.ac.jp/opensearch/search?lang=ja&q=%22%E6%B5%AE%E5%8A%9B%22&range=2&count=200&sortorder=1&type=0">CiNii</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstage.jst.go.jp/result/global/-char/ja?globalSearchKey=%22%E6%B5%AE%E5%8A%9B%22">J-STAGE</a> <b>·</b> <a rel="nofollow" class="external text" href="https://ndlsearch.ndl.go.jp/api/openurl?any=%22%E6%B5%AE%E5%8A%9B%22">NDL</a> <b>·</b> <a rel="nofollow" class="external text" href="https://dlib.jp/?q=%22%E6%B5%AE%E5%8A%9B%22">dlib.jp</a> <b>·</b> <a rel="nofollow" class="external text" href="https://jpsearch.go.jp/csearch/jps-cross?csid=jps-cross&keyword=%22%E6%B5%AE%E5%8A%9B%22">ジャパンサーチ</a> <b>·</b> <a rel="nofollow" class="external text" href="https://wikipedialibrary.wmflabs.org/partners/">TWL</a></span></small></span> <span class="date-container"><i>(<span class="date"><span title="2011年6月">2011年6月</span></span>)</i></span></div></td></tr></tbody></table> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r101304250"><table class="box-Expand_language plainlinks metadata ambox ambox-notice" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Translation_A%E3%81%82.svg/50px-Translation_A%E3%81%82.svg.png" decoding="async" width="50" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Translation_A%E3%81%82.svg/75px-Translation_A%E3%81%82.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Translation_A%E3%81%82.svg/100px-Translation_A%E3%81%82.svg.png 2x" data-file-width="473" data-file-height="150" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">この記事は<b>英語版の<a href="https://en.wikipedia.org/wiki/Buoyancy" class="extiw" title="en:Buoyancy">対応するページ</a>を翻訳することにより充実させることができます。</b><small>（<span title="2024年8月">2024年8月</span>）</small><div class="mw-collapsible mw-collapsed" style="box-sizing:border-box;width:100%;font-size:95%;padding:4px;border:none;"><div class="skin-nightmode-reset-color" style="font-size:100%;line-height:1.6;font-weight:bold;text-align:center;;padding-right: 3em; font-weight: normal; text-align: left"><small>翻訳前に重要な指示を読むには右にある[表示]をクリックしてください。</small></div><div class="mw-collapsible-content" style="text-align:left;;overflow-x:visible;overflow-y:visible;"> <ul><li>英語版記事を<a rel="nofollow" class="external text" href="https://en-m-wikipedia-org.translate.goog/wiki/Buoyancy?_x_tr_sl=en&_x_tr_tl=ja&_x_tr_hl=ja">日本語へ機械翻訳したバージョン</a>（Google翻訳）。</li> <li>万が一翻訳の手がかりとして機械翻訳を用いた場合、翻訳者は必ず翻訳元原文を参照して機械翻訳の誤りを訂正し、正確な翻訳にしなければなりません。これが成されていない場合、<b>記事は削除の方針<a href="/wiki/Wikipedia:DP#G-3" class="mw-redirect" title="Wikipedia:DP">G-3</a>に基づき、削除される可能性があります。</b></li> <li>信頼性が低いまたは低品質な文章を翻訳しないでください。もし可能ならば、文章を他言語版記事に示された文献で正しいかどうかを確認してください。</li> <li><a href="/wiki/Wikipedia:%E3%82%A6%E3%82%A3%E3%82%AD%E3%83%9A%E3%83%87%E3%82%A3%E3%82%A2%E5%86%85%E3%81%A7%E3%81%AE%E3%82%B3%E3%83%94%E3%83%BC" title="Wikipedia:ウィキペディア内でのコピー">履歴継承</a>を行うため、<a href="/wiki/Help:%E8%A6%81%E7%B4%84%E6%AC%84" title="Help:要約欄">要約欄</a>に翻訳元となった記事のページ名・版について記述する必要があります。記述方法については、<a href="/wiki/Wikipedia:%E7%BF%BB%E8%A8%B3%E3%81%AE%E3%82%AC%E3%82%A4%E3%83%89%E3%83%A9%E3%82%A4%E3%83%B3#要約欄への記入" title="Wikipedia:翻訳のガイドライン">Wikipedia:翻訳のガイドライン#要約欄への記入</a>を参照ください。</li> <li>翻訳後、<code>{{<a href="/wiki/Template:%E7%BF%BB%E8%A8%B3%E5%91%8A%E7%9F%A5" title="Template:翻訳告知">翻訳告知</a>|en|Buoyancy|…}}</code>を<a href="/wiki/%E3%83%8E%E3%83%BC%E3%83%88:%E6%B5%AE%E5%8A%9B" title="ノート:浮力">ノート</a>に追加することもできます。</li> <li><a href="/wiki/Wikipedia:%E7%BF%BB%E8%A8%B3%E3%81%AE%E3%82%AC%E3%82%A4%E3%83%89%E3%83%A9%E3%82%A4%E3%83%B3" title="Wikipedia:翻訳のガイドライン">Wikipedia:翻訳のガイドライン</a>に、より詳細な翻訳の手順・指針についての説明があります。</li></ul></div></div></div></td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Buoyancy.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/74/Buoyancy.svg/220px-Buoyancy.svg.png" decoding="async" width="220" height="276" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/74/Buoyancy.svg/330px-Buoyancy.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/74/Buoyancy.svg/440px-Buoyancy.svg.png 2x" data-file-width="300" data-file-height="376" /></a><figcaption>浮力の例の説明図。水面に浮いていて静止している物体では、重力（gravity）と浮力（buoyancy）とが、つりあっている。</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Pressure_distribution_on_an_immersed_cube.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Pressure_distribution_on_an_immersed_cube.png/220px-Pressure_distribution_on_an_immersed_cube.png" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Pressure_distribution_on_an_immersed_cube.png/330px-Pressure_distribution_on_an_immersed_cube.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Pressure_distribution_on_an_immersed_cube.png/440px-Pressure_distribution_on_an_immersed_cube.png 2x" data-file-width="1800" data-file-height="1201" /></a><figcaption>水圧の説明図。水深が深くなるほど、比例して水圧が強くなる。水圧の方向は、物体の面に垂直方向に働く。</figcaption></figure> <p><b>浮力</b>（ふりょく、<a href="/wiki/%E8%8B%B1%E8%AA%9E" title="英語">英</a>: <span lang="en">buoyancy</span>）とは、<a href="/wiki/%E6%B0%B4" title="水">水</a>などの<a href="/wiki/%E6%B5%81%E4%BD%93" title="流体">流体</a>中にある<a href="/wiki/%E7%89%A9%E4%BD%93" title="物体">物体</a>に<a href="/wiki/%E9%87%8D%E5%8A%9B" title="重力">重力</a>とは逆の方向に作用する<a href="/wiki/%E5%8A%9B_(%E7%89%A9%E7%90%86%E5%AD%A6)" title="力 (物理学)">力</a>である。 </p><p>浮力の原因は<a href="/wiki/%E3%82%A2%E3%83%AB%E3%82%AD%E3%83%A1%E3%83%87%E3%82%B9%E3%81%AE%E5%8E%9F%E7%90%86" title="アルキメデスの原理">アルキメデスの原理</a>によって説明される。物体は流体から<a href="/wiki/%E5%9C%A7%E5%8A%9B" title="圧力">圧力</a>（<a href="/wiki/%E9%9D%99%E6%B0%B4%E5%9C%A7" class="mw-redirect" title="静水圧">静水圧</a>）を受けている。このとき圧力は物体の上と下では異なり（<a href="/wiki/%E5%AF%8C%E5%A3%AB%E5%B1%B1" title="富士山">富士山</a>の頂上の<a href="/wiki/%E6%B0%97%E5%9C%A7" title="気圧">気圧</a>と麓の気圧のように）、下から受ける力の方が大きい。この物体が受ける上下の力の差が浮力である。すなわち、物体には上向きの力が作用する。 </p><p>物体が流体にすべて浸かった場合､深さが変わろうと浮力が変わることはない｡ </p> <div class="mw-heading mw-heading2"><h2 id="定式化"><span id=".E5.AE.9A.E5.BC.8F.E5.8C.96"></span>定式化</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%B5%AE%E5%8A%9B&action=edit&section=1" title="節を編集: 定式化"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>物体が受ける浮力は、その物体と同じ体積の（周囲の）流体に作用する重力に等しい。すなわち以下のようになる。 </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle F_{b}=\rho _{f}Vg}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>F</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>b</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>ρ</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>f</mi> </mrow> </msub> <mi>V</mi> <mi>g</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle F_{b}=\rho _{f}Vg}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/af8b4d767765a1d67f72e662339c36aa4d4c4fe3" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:10.772ex; height:2.843ex;" alt="{\displaystyle F_{b}=\rho _{f}Vg}"></span></dd> <dd><i>F</i><sub>b</sub> ：浮力（<a href="/wiki/%E3%83%8B%E3%83%A5%E3%83%BC%E3%83%88%E3%83%B3_(%E5%8D%98%E4%BD%8D)" title="ニュートン (単位)">N</a>, kg·m/s²）</dd> <dd>ρ<sub>f</sub> ：流体の<a href="/wiki/%E5%AF%86%E5%BA%A6" title="密度">密度</a>（kg/m³）</dd> <dd><i>V</i> ：物体の<a href="/wiki/%E4%BD%93%E7%A9%8D" title="体積">体積</a>（m³）</dd> <dd><i>g</i> ：<a href="/wiki/%E9%87%8D%E5%8A%9B%E5%8A%A0%E9%80%9F%E5%BA%A6" title="重力加速度">重力加速度</a>（m/s²）</dd></dl> <p>この式の厳密な導出には<a href="/wiki/%E7%99%BA%E6%95%A3%E5%AE%9A%E7%90%86" title="発散定理">発散定理</a>を用いる。 </p><p>さらに、物体の密度が ρ<sub>s</sub> であるとすると、物体にはたらく重力と浮力との<a href="/wiki/%E5%90%88%E5%8A%9B" class="mw-redirect" title="合力">合力</a>は（上向きを正として）、 </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle F=(\rho _{f}-\rho _{s})Vg}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>F</mi> <mo>=</mo> <mo stretchy="false">(</mo> <msub> <mi>ρ</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>f</mi> </mrow> </msub> <mo>−</mo> <msub> <mi>ρ</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>s</mi> </mrow> </msub> <mo stretchy="false">)</mo> <mi>V</mi> <mi>g</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle F=(\rho _{f}-\rho _{s})Vg}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/61fa1063e29a532e5153503de9743730d1235627" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:16.936ex; height:3.009ex;" alt="{\displaystyle F=(\rho _{f}-\rho _{s})Vg}"></span></dd></dl> <p>となる。したがって </p> <ul><li>物体が流体より軽い（ρ<sub>s</sub> < ρ<sub>f</sub> ）とき、<i>F</i> > 0 、すなわち物体は浮く</li> <li>物体が流体より重い（ρ<sub>s</sub> > ρ<sub>f</sub> ）とき、<i>F</i> < 0 、すなわち物体は沈む</li></ul> <p>ことが分かる。 </p> <div class="mw-heading mw-heading2"><h2 id="無次元数"><span id=".E7.84.A1.E6.AC.A1.E5.85.83.E6.95.B0"></span>無次元数</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%B5%AE%E5%8A%9B&action=edit&section=2" title="節を編集: 無次元数"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/%E6%B5%81%E4%BD%93%E5%8A%9B%E5%AD%A6" title="流体力学">流体力学</a>で用いられる<a href="/wiki/%E7%84%A1%E6%AC%A1%E5%85%83%E9%87%8F" title="無次元量">無次元量</a>のうち、浮力に関するものには以下がある。いずれも、他の何らかの力との大きさの比を表す。 </p> <ul><li><a href="/wiki/%E3%83%AA%E3%83%81%E3%83%A3%E3%83%BC%E3%83%89%E3%82%BD%E3%83%B3%E6%95%B0" title="リチャードソン数">リチャードソン数</a> - 慣性力との比</li> <li><a href="/wiki/%E3%82%B0%E3%83%A9%E3%82%B9%E3%83%9B%E3%83%95%E6%95%B0" title="グラスホフ数">グラスホフ数</a> - 粘性力との比</li> <li><a href="/wiki/%E3%83%AC%E3%82%A4%E3%83%AA%E3%83%BC%E6%95%B0" title="レイリー数">レイリー数</a> - 熱拡散との比</li> <li><a href="/wiki/%E3%82%A8%E3%83%88%E3%83%99%E3%82%B9%E6%95%B0" title="エトベス数">エトベス数</a> - 表面張力との比</li></ul> <p><br /> </p> <div class="mw-heading mw-heading2"><h2 id="関連項目"><span id=".E9.96.A2.E9.80.A3.E9.A0.85.E7.9B.AE"></span>関連項目</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%B5%AE%E5%8A%9B&action=edit&section=3" title="節を編集: 関連項目"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r94202605">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:#f9f9f9;display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><div class="side-box side-box-right plainlinks sistersitebox noprint" style="width:22em;"> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist" style="font-size:100%;">ウィキメディア・コモンズには、<b><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Buoyancy?uselang=ja">浮力</a></span></b>に関連するカテゴリがあります。</div></div> </div> <ul><li><span title="リンク先の項目はまだありません。新規の執筆や他言語版からの翻訳が望まれます。"><a href="/w/index.php?title=%E4%B8%AD%E6%80%A7%E6%B5%AE%E5%8A%9B&action=edit&redlink=1" class="new" title="中性浮力 (存在しないページ)">中性浮力</a><span style="font-size: 0.77em; font-weight: normal;" class="noprint">（<a href="https://en.wikipedia.org/wiki/Neutral_buoyancy" class="extiw" title="en:Neutral buoyancy">英語版</a>）</span></span> ‐ 浮力と重力が拮抗した状態。</li> <li><a href="/wiki/%E3%82%A2%E3%83%AB%E3%82%AD%E3%83%A1%E3%83%87%E3%82%B9%E3%81%AE%E5%8E%9F%E7%90%86" title="アルキメデスの原理">アルキメデスの原理</a></li> <li><a href="/wiki/%E6%B6%B2%E7%8A%B6%E5%8C%96%E7%8F%BE%E8%B1%A1" title="液状化現象">液状化現象</a></li> <li><a href="/wiki/%E8%88%B9" title="船">船</a></li> <li><a href="/wiki/%E9%A3%9B%E8%A1%8C%E8%88%B9" title="飛行船">飛行船</a>・<a href="/wiki/%E6%B0%97%E7%90%83" title="気球">気球</a>・<a href="/wiki/%E9%A2%A8%E8%88%B9" title="風船">風船</a></li> <li><a href="/wiki/%E6%8F%9A%E5%8A%9B" title="揚力">揚力</a></li></ul> <div role="navigation" class="navbox authority-control" aria-label="Navbox" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Help:%E5%85%B8%E6%8B%A0%E7%AE%A1%E7%90%86" title="Help:典拠管理">典拠管理データベース</a>: 国立図書館 <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a 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