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vector-page-titlebar-toc vector-button-flush-left" > <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="開/收內容一覽" > <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">開/收內容一覽</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">原子質量</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="去睇另一種語文嘅文章。有99種語言版本。" > <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-99" 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">99種語言</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/Atoommassa" title="Atoommassa – 南非荷蘭文" lang="af" hreflang="af" data-title="Atoommassa" data-language-autonym="Afrikaans" data-language-local-name="南非荷蘭文" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Peso_atomico" title="Peso atomico – 阿拉貢文" lang="an" hreflang="an" data-title="Peso atomico" data-language-autonym="Aragonés" data-language-local-name="阿拉貢文" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%83%D8%AA%D9%84%D8%A9_%D8%B0%D8%B1%D9%8A%D8%A9" title="كتلة ذرية – 阿拉伯文" lang="ar" hreflang="ar" data-title="كتلة ذرية" data-language-autonym="العربية" data-language-local-name="阿拉伯文" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D9%83%D8%AA%D9%84%D8%A9_%D8%AF%D8%B1%D9%8A%D8%A9" title="كتلة درية – 摩洛哥阿拉伯文" lang="ary" hreflang="ary" data-title="كتلة درية" data-language-autonym="الدارجة" data-language-local-name="摩洛哥阿拉伯文" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Masa_at%C3%B3mica" title="Masa atómica – 阿斯圖里亞文" lang="ast" hreflang="ast" data-title="Masa atómica" data-language-autonym="Asturianu" data-language-local-name="阿斯圖里亞文" 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/Atom_k%C3%BCtl%C9%99si" title="Atom kütləsi – 亞塞拜然文" lang="az" hreflang="az" data-title="Atom kütləsi" data-language-autonym="Azərbaycanca" data-language-local-name="亞塞拜然文" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC_%D0%BC%D0%B0%D1%81%D1%81%D0%B0%D2%BB%D1%8B" title="Атом массаһы – 巴什客爾文" lang="ba" hreflang="ba" data-title="Атом массаһы" data-language-autonym="Башҡортса" data-language-local-name="巴什客爾文" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%90%D0%B4%D0%BD%D0%BE%D1%81%D0%BD%D0%B0%D1%8F_%D0%B0%D1%82%D0%B0%D0%BC%D0%BD%D0%B0%D1%8F_%D0%BC%D0%B0%D1%81%D0%B0" title="Адносная атамная маса – 白俄羅斯文" lang="be" hreflang="be" data-title="Адносная атамная маса" data-language-autonym="Беларуская" data-language-local-name="白俄羅斯文" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%90%D0%B4%D0%BD%D0%BE%D1%81%D0%BD%D0%B0%D1%8F_%D0%B0%D1%82%D0%B0%D0%BC%D0%BD%D0%B0%D1%8F_%D0%BC%D0%B0%D1%81%D0%B0" title="Адносная атамная маса – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Адносная атамная маса" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D0%BD%D0%B0_%D0%BC%D0%B0%D1%81%D0%B0" title="Атомна маса – 保加利亞文" lang="bg" hreflang="bg" data-title="Атомна маса" data-language-autonym="Български" data-language-local-name="保加利亞文" 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%A6%BE%E0%A6%B0%E0%A6%AE%E0%A6%BE%E0%A6%A3%E0%A6%AC%E0%A6%BF%E0%A6%95_%E0%A6%AD%E0%A6%B0" title="পারমাণবিক ভর – 孟加拉文" lang="bn" hreflang="bn" data-title="পারমাণবিক ভর" data-language-autonym="বাংলা" data-language-local-name="孟加拉文" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Mas_atomek" title="Mas atomek – 布列塔尼文" lang="br" hreflang="br" data-title="Mas atomek" data-language-autonym="Brezhoneg" data-language-local-name="布列塔尼文" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Atomska_masa" title="Atomska masa – 波士尼亞文" lang="bs" hreflang="bs" data-title="Atomska masa" data-language-autonym="Bosanski" data-language-local-name="波士尼亞文" 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/Massa_at%C3%B2mica" title="Massa atòmica – 加泰羅尼亞文" lang="ca" hreflang="ca" data-title="Massa atòmica" data-language-autonym="Català" data-language-local-name="加泰羅尼亞文" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DA%A9%DB%8E%D8%B4%DB%8C_%D8%A6%DB%95%D8%AA%DB%86%D9%85%DB%8C" title="کێشی ئەتۆمی – 索拉尼庫爾德文" lang="ckb" hreflang="ckb" data-title="کێشی ئەتۆمی" data-language-autonym="کوردی" data-language-local-name="索拉尼庫爾德文" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Relativn%C3%AD_atomov%C3%A1_hmotnost" title="Relativní atomová hmotnost – 捷克文" lang="cs" hreflang="cs" data-title="Relativní atomová hmotnost" data-language-autonym="Čeština" data-language-local-name="捷克文" 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/Atommasse" title="Atommasse – 丹麥文" lang="da" hreflang="da" data-title="Atommasse" data-language-autonym="Dansk" data-language-local-name="丹麥文" 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/Atommasse" title="Atommasse – 德文" lang="de" hreflang="de" data-title="Atommasse" data-language-autonym="Deutsch" data-language-local-name="德文" 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%91%CF%84%CE%BF%CE%BC%CE%B9%CE%BA%CF%8C_%CE%B2%CE%AC%CF%81%CE%BF%CF%82" title="Ατομικό βάρος – 希臘文" lang="el" hreflang="el" data-title="Ατομικό βάρος" data-language-autonym="Ελληνικά" data-language-local-name="希臘文" 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/Atomic_mass" title="Atomic mass – 英文" lang="en" hreflang="en" data-title="Atomic mass" data-language-autonym="English" data-language-local-name="英文" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Atomomaso" title="Atomomaso – 世界文" lang="eo" hreflang="eo" data-title="Atomomaso" data-language-autonym="Esperanto" data-language-local-name="世界文" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Masa_at%C3%B3mica" title="Masa atómica – 西班牙文" lang="es" hreflang="es" data-title="Masa atómica" data-language-autonym="Español" data-language-local-name="西班牙文" 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/Aatommass" title="Aatommass – 愛沙尼亞文" lang="et" hreflang="et" data-title="Aatommass" data-language-autonym="Eesti" data-language-local-name="愛沙尼亞文" 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/Masa_atomiko" title="Masa atomiko – 巴斯克文" lang="eu" hreflang="eu" data-title="Masa atomiko" data-language-autonym="Euskara" data-language-local-name="巴斯克文" 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%AC%D8%B1%D9%85_%D8%A7%D8%AA%D9%85%DB%8C" title="جرم اتمی – 波斯文" lang="fa" hreflang="fa" data-title="جرم اتمی" data-language-autonym="فارسی" data-language-local-name="波斯文" 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/Atomimassa" title="Atomimassa – 芬蘭文" lang="fi" hreflang="fi" data-title="Atomimassa" data-language-autonym="Suomi" data-language-local-name="芬蘭文" 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/Masse_atomique" title="Masse atomique – 法文" lang="fr" hreflang="fr" data-title="Masse atomique" data-language-autonym="Français" data-language-local-name="法文" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-fur mw-list-item"><a href="https://fur.wikipedia.org/wiki/Masse_atomiche" title="Masse atomiche – 弗留利文" lang="fur" hreflang="fur" data-title="Masse atomiche" data-language-autonym="Furlan" data-language-local-name="弗留利文" class="interlanguage-link-target"><span>Furlan</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Atoommassa" title="Atoommassa – 西弗里西亞文" lang="fy" hreflang="fy" data-title="Atoommassa" data-language-autonym="Frysk" data-language-local-name="西弗里西亞文" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Mais_adamhach" title="Mais adamhach – 愛爾蘭文" lang="ga" hreflang="ga" data-title="Mais adamhach" data-language-autonym="Gaeilge" data-language-local-name="愛爾蘭文" 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/Masa_at%C3%B3mica" title="Masa atómica – 加里西亞文" lang="gl" hreflang="gl" data-title="Masa atómica" data-language-autonym="Galego" data-language-local-name="加里西亞文" 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%9E%D7%A9%D7%A7%D7%9C_%D7%90%D7%98%D7%95%D7%9E%D7%99" title="משקל אטומי – 希伯來文" lang="he" hreflang="he" data-title="משקל אטומי" data-language-autonym="עברית" data-language-local-name="希伯來文" 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%AA%E0%A4%B0%E0%A4%AE%E0%A4%BE%E0%A4%A3%E0%A5%81_%E0%A4%A6%E0%A5%8D%E0%A4%B0%E0%A4%B5%E0%A5%8D%E0%A4%AF%E0%A4%AE%E0%A4%BE%E0%A4%A8" title="परमाणु द्रव्यमान – 北印度文" lang="hi" hreflang="hi" data-title="परमाणु द्रव्यमान" data-language-autonym="हिन्दी" data-language-local-name="北印度文" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hif mw-list-item"><a href="https://hif.wikipedia.org/wiki/Atomic_mass" title="Atomic mass – 斐濟印地文" lang="hif" hreflang="hif" data-title="Atomic mass" data-language-autonym="Fiji Hindi" data-language-local-name="斐濟印地文" class="interlanguage-link-target"><span>Fiji Hindi</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Relativna_atomska_masa" title="Relativna atomska masa – 克羅埃西亞文" lang="hr" hreflang="hr" data-title="Relativna atomska masa" data-language-autonym="Hrvatski" data-language-local-name="克羅埃西亞文" 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/Mas_atomik" title="Mas atomik – 海地文" lang="ht" hreflang="ht" data-title="Mas atomik" data-language-autonym="Kreyòl ayisyen" data-language-local-name="海地文" 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/Atomt%C3%B6meg" title="Atomtömeg – 匈牙利文" lang="hu" hreflang="hu" data-title="Atomtömeg" data-language-autonym="Magyar" data-language-local-name="匈牙利文" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B1%D5%BF%D5%B8%D5%B4%D5%A1%D5%B5%D5%AB%D5%B6_%D5%A6%D5%A1%D5%B6%D5%A3%D5%BE%D5%A1%D5%AE" title="Ատոմային զանգված – 亞美尼亞文" lang="hy" hreflang="hy" data-title="Ատոմային զանգված" data-language-autonym="Հայերեն" data-language-local-name="亞美尼亞文" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Massa_atom" title="Massa atom – 印尼文" lang="id" hreflang="id" data-title="Massa atom" data-language-autonym="Bahasa Indonesia" data-language-local-name="印尼文" 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/At%C3%B3mmassi" title="Atómmassi – 冰島文" lang="is" hreflang="is" data-title="Atómmassi" data-language-autonym="Íslenska" data-language-local-name="冰島文" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Massa_atomica" title="Massa atomica – 義大利文" lang="it" hreflang="it" data-title="Massa atomica" data-language-autonym="Italiano" data-language-local-name="義大利文" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%8E%9F%E5%AD%90%E9%87%8F" title="原子量 – 日文" lang="ja" hreflang="ja" data-title="原子量" data-language-autonym="日本語" data-language-local-name="日文" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-jbo mw-list-item"><a href="https://jbo.wikipedia.org/wiki/na%27orteryratni" title="na'orteryratni – 邏輯文" lang="jbo" hreflang="jbo" data-title="na'orteryratni" data-language-autonym="La .lojban." data-language-local-name="邏輯文" class="interlanguage-link-target"><span>La .lojban.</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Massa_atom" title="Massa atom – 爪哇文" lang="jv" hreflang="jv" data-title="Massa atom" data-language-autonym="Jawa" data-language-local-name="爪哇文" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%90%E1%83%A2%E1%83%9D%E1%83%9B%E1%83%A3%E1%83%A0%E1%83%98_%E1%83%9B%E1%83%90%E1%83%A1%E1%83%90" title="ატომური მასა – 喬治亞文" lang="ka" hreflang="ka" data-title="ატომური მასა" data-language-autonym="ქართული" data-language-local-name="喬治亞文" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Takura_tabelkamt" title="Takura tabelkamt – 卡比爾文" lang="kab" hreflang="kab" data-title="Takura tabelkamt" data-language-autonym="Taqbaylit" data-language-local-name="卡比爾文" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D0%B4%D1%8B%D2%9B_%D0%BC%D0%B0%D1%81%D1%81%D0%B0" title="Атомдық масса – 哈薩克文" lang="kk" hreflang="kk" data-title="Атомдық масса" data-language-autonym="Қазақша" data-language-local-name="哈薩克文" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9B%90%EC%9E%90_%EC%A7%88%EB%9F%89" title="원자 질량 – 韓文" lang="ko" hreflang="ko" data-title="원자 질량" data-language-autonym="한국어" data-language-local-name="韓文" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D0%B4%D1%83%D0%BA_%D0%BC%D0%B0%D1%81%D1%81%D0%B0" title="Атомдук масса – 吉爾吉斯文" lang="ky" hreflang="ky" data-title="Атомдук масса" data-language-autonym="Кыргызча" data-language-local-name="吉爾吉斯文" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Massa_atomica" title="Massa atomica – 拉丁文" lang="la" hreflang="la" data-title="Massa atomica" data-language-autonym="Latina" data-language-local-name="拉丁文" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Atommass" title="Atommass – 盧森堡文" lang="lb" hreflang="lb" data-title="Atommass" data-language-autonym="Lëtzebuergesch" data-language-local-name="盧森堡文" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Atoomgewich" title="Atoomgewich – 林堡文" lang="li" hreflang="li" data-title="Atoomgewich" data-language-autonym="Limburgs" data-language-local-name="林堡文" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lmo badge-Q17437796 badge-featuredarticle mw-list-item" title="正文"><a href="https://lmo.wikipedia.org/wiki/Massa_atomica" title="Massa atomica – 倫巴底文" lang="lmo" hreflang="lmo" data-title="Massa atomica" data-language-autonym="Lombard" data-language-local-name="倫巴底文" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Atomin%C4%97_mas%C4%97" title="Atominė masė – 立陶宛文" lang="lt" hreflang="lt" data-title="Atominė masė" data-language-autonym="Lietuvių" data-language-local-name="立陶宛文" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Atommasa" title="Atommasa – 拉脫維亞文" lang="lv" hreflang="lv" data-title="Atommasa" data-language-autonym="Latviešu" data-language-local-name="拉脫維亞文" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D1%81%D0%BA%D0%B0_%D0%BC%D0%B0%D1%81%D0%B0" title="Атомска маса – 馬其頓文" lang="mk" hreflang="mk" data-title="Атомска маса" data-language-autonym="Македонски" data-language-local-name="馬其頓文" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC_%D0%BC%D0%B0%D1%81%D1%81" title="Атом масс – 蒙古文" lang="mn" hreflang="mn" data-title="Атом масс" data-language-autonym="Монгол" data-language-local-name="蒙古文" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%85%E0%A4%A3%E0%A5%81%E0%A4%AD%E0%A4%BE%E0%A4%B0" title="अणुभार – 馬拉地文" lang="mr" hreflang="mr" data-title="अणुभार" data-language-autonym="मराठी" data-language-local-name="馬拉地文" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Jisim_atom" title="Jisim atom – 馬來文" lang="ms" hreflang="ms" data-title="Jisim atom" data-language-autonym="Bahasa Melayu" data-language-local-name="馬來文" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Atommass" title="Atommass – 低地德文" lang="nds" hreflang="nds" data-title="Atommass" data-language-autonym="Plattdüütsch" data-language-local-name="低地德文" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Atoommassa" title="Atoommassa – 荷蘭文" lang="nl" hreflang="nl" data-title="Atoommassa" data-language-autonym="Nederlands" data-language-local-name="荷蘭文" 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/Atommasse" title="Atommasse – 耐諾斯克挪威文" lang="nn" hreflang="nn" data-title="Atommasse" data-language-autonym="Norsk nynorsk" data-language-local-name="耐諾斯克挪威文" 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/Atommasse" title="Atommasse – 巴克摩挪威文" lang="nb" hreflang="nb" data-title="Atommasse" data-language-autonym="Norsk bokmål" data-language-local-name="巴克摩挪威文" 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%AA%E0%A8%B0%E0%A8%AE%E0%A8%BE%E0%A8%A3%E0%A8%B5%E0%A9%80_%E0%A8%AD%E0%A8%BE%E0%A8%B0" title="ਪਰਮਾਣਵੀ ਭਾਰ – 旁遮普文" lang="pa" hreflang="pa" data-title="ਪਰਮਾਣਵੀ ਭਾਰ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="旁遮普文" 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/Masa_atomowa" title="Masa atomowa – 波蘭文" lang="pl" hreflang="pl" data-title="Masa atomowa" data-language-autonym="Polski" data-language-local-name="波蘭文" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Massa_at%C3%B2mica" title="Massa atòmica – 皮埃蒙特文" lang="pms" hreflang="pms" data-title="Massa atòmica" data-language-autonym="Piemontèis" data-language-local-name="皮埃蒙特文" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%A7%DB%8C%D9%B9%D9%85%DB%8C_%D8%A8%DA%BE%D8%A7%D8%B1" title="ایٹمی بھار – Western Punjabi" lang="pnb" hreflang="pnb" data-title="ایٹمی بھار" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Massa_at%C3%B3mica" title="Massa atómica – 葡萄牙文" lang="pt" hreflang="pt" data-title="Massa atómica" data-language-autonym="Português" data-language-local-name="葡萄牙文" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/I%C3%B1uku_wisnu" title="Iñuku wisnu – 蓋楚瓦文" lang="qu" hreflang="qu" data-title="Iñuku wisnu" data-language-autonym="Runa Simi" data-language-local-name="蓋楚瓦文" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Mas%C4%83_atomic%C4%83" title="Masă atomică – 羅馬尼亞文" lang="ro" hreflang="ro" data-title="Masă atomică" data-language-autonym="Română" data-language-local-name="羅馬尼亞文" 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%90%D1%82%D0%BE%D0%BC%D0%BD%D0%B0%D1%8F_%D0%BC%D0%B0%D1%81%D1%81%D0%B0" title="Атомная масса – 俄文" lang="ru" hreflang="ru" data-title="Атомная масса" data-language-autonym="Русский" data-language-local-name="俄文" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-rue mw-list-item"><a href="https://rue.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D0%BE%D0%B2%D0%B0_%D0%BC%D0%B0%D1%81%D0%B0" title="Атомова маса – 盧森尼亞文" lang="rue" hreflang="rue" data-title="Атомова маса" data-language-autonym="Русиньскый" data-language-local-name="盧森尼亞文" class="interlanguage-link-target"><span>Русиньскый</span></a></li><li class="interlanguage-link interwiki-sd mw-list-item"><a href="https://sd.wikipedia.org/wiki/%D8%A7%D9%8A%D9%BD%D9%85%D9%8A_%D9%85%D8%A7%D9%8A%D9%88" title="ايٽمي مايو – 信德文" lang="sd" hreflang="sd" data-title="ايٽمي مايو" data-language-autonym="سنڌي" data-language-local-name="信德文" class="interlanguage-link-target"><span>سنڌي</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Atomska_masa" title="Atomska masa – 塞爾維亞克羅埃西亞文" lang="sh" hreflang="sh" data-title="Atomska masa" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="塞爾維亞克羅埃西亞文" 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%B4%E0%B6%BB%E0%B6%B8%E0%B7%8F%E0%B6%AB%E0%B7%94%E0%B6%9A_%E0%B7%83%E0%B7%8A%E0%B6%9A%E0%B6%B1%E0%B7%8A%E0%B6%B0%E0%B6%BA" title="පරමාණුක ස්කන්ධය – 僧伽羅文" lang="si" hreflang="si" data-title="පරමාණුක ස්කන්ධය" data-language-autonym="සිංහල" data-language-local-name="僧伽羅文" 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/Atomic_mass" title="Atomic mass – Simple English" lang="en-simple" hreflang="en-simple" data-title="Atomic mass" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/At%C3%B3mov%C3%A1_hmotnos%C5%A5" title="Atómová hmotnosť – 斯洛伐克文" lang="sk" hreflang="sk" data-title="Atómová hmotnosť" data-language-autonym="Slovenčina" data-language-local-name="斯洛伐克文" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Atomska_te%C5%BEa" title="Atomska teža – 斯洛維尼亞文" lang="sl" hreflang="sl" data-title="Atomska teža" data-language-autonym="Slovenščina" data-language-local-name="斯洛維尼亞文" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/Cuf_atam" title="Cuf atam – 索馬利文" lang="so" hreflang="so" data-title="Cuf atam" data-language-autonym="Soomaaliga" data-language-local-name="索馬利文" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Masa_atomike" title="Masa atomike – 阿爾巴尼亞文" lang="sq" hreflang="sq" data-title="Masa atomike" data-language-autonym="Shqip" data-language-local-name="阿爾巴尼亞文" 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%A0%D0%B5%D0%BB%D0%B0%D1%82%D0%B8%D0%B2%D0%BD%D0%B0_%D0%B0%D1%82%D0%BE%D0%BC%D1%81%D0%BA%D0%B0_%D0%BC%D0%B0%D1%81%D0%B0" title="Релативна атомска маса – 塞爾維亞文" lang="sr" hreflang="sr" data-title="Релативна атомска маса" data-language-autonym="Српски / srpski" data-language-local-name="塞爾維亞文" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-stq mw-list-item"><a href="https://stq.wikipedia.org/wiki/Atommasse" title="Atommasse – 沙特菲士蘭文" lang="stq" hreflang="stq" data-title="Atommasse" data-language-autonym="Seeltersk" data-language-local-name="沙特菲士蘭文" class="interlanguage-link-target"><span>Seeltersk</span></a></li><li class="interlanguage-link interwiki-su mw-list-item"><a href="https://su.wikipedia.org/wiki/Massa_atom" title="Massa atom – 巽他文" lang="su" hreflang="su" data-title="Massa atom" data-language-autonym="Sunda" data-language-local-name="巽他文" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Atommassa" title="Atommassa – 瑞典文" lang="sv" hreflang="sv" data-title="Atommassa" data-language-autonym="Svenska" data-language-local-name="瑞典文" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Uzani_atomia" title="Uzani atomia – 史瓦希里文" lang="sw" hreflang="sw" data-title="Uzani atomia" data-language-autonym="Kiswahili" data-language-local-name="史瓦希里文" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%85%E0%AE%A3%E0%AF%81_%E0%AE%A8%E0%AE%BF%E0%AE%B1%E0%AF%88" title="அணு நிறை – 坦米爾文" lang="ta" hreflang="ta" data-title="அணு நிறை" data-language-autonym="தமிழ்" data-language-local-name="坦米爾文" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%9C%D0%B0%D1%81%D1%81%D0%B0%D0%B8_%D0%B0%D1%82%D0%BE%D0%BC%D3%A3" title="Массаи атомӣ – 塔吉克文" lang="tg" hreflang="tg" data-title="Массаи атомӣ" data-language-autonym="Тоҷикӣ" data-language-local-name="塔吉克文" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A1%E0%B8%A7%E0%B8%A5%E0%B8%AD%E0%B8%B0%E0%B8%95%E0%B8%AD%E0%B8%A1" title="มวลอะตอม – 泰文" lang="th" hreflang="th" data-title="มวลอะตอม" data-language-autonym="ไทย" data-language-local-name="泰文" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Atomikong_masa" title="Atomikong masa – 塔加路族文" lang="tl" hreflang="tl" data-title="Atomikong masa" data-language-autonym="Tagalog" data-language-local-name="塔加路族文" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Atom_k%C3%BCtlesi" title="Atom kütlesi – 土耳其文" lang="tr" hreflang="tr" data-title="Atom kütlesi" data-language-autonym="Türkçe" data-language-local-name="土耳其文" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D0%BD%D0%B0_%D0%BC%D0%B0%D1%81%D0%B0" title="Атомна маса – 烏克蘭文" lang="uk" hreflang="uk" data-title="Атомна маса" data-language-autonym="Українська" data-language-local-name="烏克蘭文" 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/%D8%AC%D9%88%DB%81%D8%B1%DB%8C_%DA%A9%D9%85%DB%8C%D8%AA" title="جوہری کمیت – 烏都文" lang="ur" hreflang="ur" data-title="جوہری کمیت" data-language-autonym="اردو" data-language-local-name="烏都文" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Atom_massasi" title="Atom massasi – 烏茲別克文" lang="uz" hreflang="uz" data-title="Atom massasi" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="烏茲別克文" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Nguy%C3%AAn_t%E1%BB%AD_kh%E1%BB%91i" title="Nguyên tử khối – 越南文" lang="vi" hreflang="vi" data-title="Nguyên tử khối" data-language-autonym="Tiếng Việt" data-language-local-name="越南文" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Masa_atomika" title="Masa atomika – 瓦瑞文" lang="war" hreflang="war" data-title="Masa atomika" data-language-autonym="Winaray" data-language-local-name="瓦瑞文" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%8E%9F%E5%AD%90%E9%87%8F" title="原子量 – 吳語" lang="wuu" hreflang="wuu" data-title="原子量" data-language-autonym="吴语" 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class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q3840065" title="連到接住資料儲存庫嘅項目[g]" accesskey="g"><span>維基數據項</span></a></li> </ul> </div> </div> </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="頁面工具"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="閱讀設定"> <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">閱讀設定</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">移去側欄</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">收埋</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">出自維基百科，自由嘅百科全書</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom">(由<a href="/w/index.php?title=%E5%8E%9F%E5%AD%90%E9%87%8D%E9%87%8F&redirect=no" class="mw-redirect" title="原子重量">原子重量</a>跳轉過嚟)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="yue" dir="ltr"><p><b>原子質量</b>（Atomic mass）係指某一個特定<a href="/wiki/%E5%90%8C%E4%BD%8D%E7%B4%A0" title="同位素">同位素</a>嘅質量。佢係一個原子入面<a href="/wiki/%E8%B3%AA%E5%AD%90" title="質子">質子</a>、<a href="/wiki/%E4%B8%AD%E5%AD%90" title="中子">中子</a>同埋<a href="/wiki/%E9%9B%BB%E5%AD%90" title="電子">電子</a>嘅質量。因為好多<a href="/wiki/%E5%85%83%E7%B4%A0" title="元素">元素</a>都有超過一種<a href="/wiki/%E5%90%8C%E4%BD%8D%E7%B4%A0" title="同位素">同位素</a>，所以<a href="/wiki/%E5%85%83%E7%B4%A0%E8%A1%A8" class="mw-redirect" title="元素表">元素表</a>入面嘅原子質量係會以唔同同位素喺大自然嘅比例再乘番佢哋嘅質量計番平均數，所以亦叫做<b>平均原子質量</b>。 </p> <div class="mw-heading mw-heading2"><h2 id="單位"><span id=".E5.96.AE.E4.BD.8D"></span>單位</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%8E%9F%E5%AD%90%E8%B3%AA%E9%87%8F&action=edit&section=1" title="編輯小節: 單位"><span>編輯</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>因為一個原子嘅質量實在太細，如果用番常用嘅<a href="/wiki/%E5%85%AC%E6%96%A4" class="mw-redirect" title="公斤">公斤</a>做單位，無論記、寫、用、計都好唔方便，於是，國際間就用<b><a href="/w/index.php?title=%E7%9B%B8%E5%B0%8D%E5%8E%9F%E5%AD%90%E8%B3%AA%E9%87%8F&action=edit&redlink=1" class="new" title="相對原子質量 (無呢版)">相對原子質量</a></b>（符號：<b>A<sub>r</sub></b>）嚟計原子質量，將一個<a href="/w/index.php?title=%E7%A2%B3-12&action=edit&redlink=1" class="new" title="碳-12 (無呢版)">碳-12</a>原子嘅相對質量規定為12.00，作為相對原子質量嘅標準。一個單位嘅原子質量換算成公制就係1.660538782(83)×10<sup>-27</sup>公斤。相對原子質量同絕對原子質量（克）嘅換算公式係： </p> <figure class="mw-default-size mw-halign-center" typeof="mw:File"><a href="/wiki/File:%E7%9B%B8%E5%B0%8D%E8%B3%AA%E9%87%8F%E6%8F%9B%E7%AE%97%E7%B5%95%E5%B0%8D%E8%B3%AA%E9%87%8F.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/7/78/%E7%9B%B8%E5%B0%8D%E8%B3%AA%E9%87%8F%E6%8F%9B%E7%AE%97%E7%B5%95%E5%B0%8D%E8%B3%AA%E9%87%8F.png" decoding="async" width="551" height="62" class="mw-file-element" data-file-width="551" data-file-height="62" /></a><figcaption></figcaption></figure> <p><br /> </p> <div class="mw-heading mw-heading2"><h2 id="歷史"><span id=".E6.AD.B7.E5.8F.B2"></span>歷史</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%8E%9F%E5%AD%90%E8%B3%AA%E9%87%8F&action=edit&section=2" title="編輯小節: 歷史"><span>編輯</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>起初，原子質量定義係以最輕嘅原子<a href="/wiki/%E6%B0%AB" title="氫">氫</a>作為1.00，1820年，英國化學家<a href="/w/index.php?title=%E5%A8%81%E5%BB%89%C2%B7%E6%99%AE%E7%95%99%E7%89%B9&action=edit&redlink=1" class="new" title="威廉·普留特 (無呢版)">威廉·普留特</a>（William Prout）假設每一種元素嘅原子質量都係氫原子質量嘅倍數。但係瑞典化學家<a href="/w/index.php?title=%E6%A5%8A%E6%96%AF%C2%B7%E9%9B%85%E5%90%84%C2%B7%E7%99%BD%E8%AC%9D%E9%81%BC%E6%96%AF&action=edit&redlink=1" class="new" title="楊斯·雅各·白謝遼斯 (無呢版)">楊斯·雅各·白謝遼斯</a>（Jöns Jacob Berzelius）之後證明就算係約數，個假設都係唔啱。例如<a href="/wiki/%E6%B0%AF" title="氯">氯</a>嘅原子質量大約喺兩個氫原子重量嘅倍數之間。不過之後發現原來咁係因為有<a href="/wiki/%E5%90%8C%E4%BD%8D%E7%B4%A0" title="同位素">同位素</a>，實際上每一個個別嘅同位素嘅原子質量的確係同氫原子質量嘅某個倍數相差細過百分之一。 </p><p>之後由二十世紀中期去到1960年代，化學學家同物理學家對原子重量單位有兩個唔同定義：化學學家以<a href="/wiki/%E6%B0%A7" title="氧">氧</a>唔同同位素嘅混合物作為原子重量16，而物理學家以氧最常見嘅同位素（有8個質子同8個中子）作為原子重量16。最後，因為<a href="/w/index.php?title=%E6%B0%A7-17&action=edit&redlink=1" class="new" title="氧-17 (無呢版)">氧-17</a>同<a href="/w/index.php?title=%E6%B0%A7-18&action=edit&redlink=1" class="new" title="氧-18 (無呢版)">氧-18</a>都會喺自然出現，所以定義一個碳-12嘅重量係12原子重量，呢個亦都係今日嘅標準。 </p> <div class="mw-heading mw-heading2"><h2 id="睇埋"><span id=".E7.9D.87.E5.9F.8B"></span>睇埋</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%8E%9F%E5%AD%90%E8%B3%AA%E9%87%8F&action=edit&section=3" title="編輯小節: 睇埋"><span>編輯</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/w/index.php?title=%E7%9B%B8%E5%B0%8D%E5%8E%9F%E5%AD%90%E8%B3%AA%E9%87%8F%E8%A1%A8&action=edit&redlink=1" class="new" title="相對原子質量表 (無呢版)">相對原子質量表</a></li> <li><a href="/wiki/%E5%90%8C%E4%BD%8D%E7%B4%A0" title="同位素">同位素</a></li> <li><a href="/w/index.php?title=%E5%88%86%E5%AD%90%E9%87%8F&action=edit&redlink=1" class="new" title="分子量 (無呢版)">分子量</a></li> <li><a href="/wiki/%E5%8E%9F%E5%AD%90%E8%B3%AA%E9%87%8F%E5%96%AE%E4%BD%8D" title="原子質量單位">原子質量單位</a></li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">由「<a dir="ltr" href="https://zh-yue.wikipedia.org/w/index.php?title=原子質量&oldid=917820">https://zh-yue.wikipedia.org/w/index.php?title=原子質量&oldid=917820</a>」收</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a 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