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Butane evaporates at <i>33<sup>o</sup>F</i> (<i>0.6 <sup>o</sup>C</i>) at atmospheric pressure.</p> <p>Vapor pressures for mixtures of the two products relative to <a href="stp-standard-ntp-normal-air-d_772.html" title="STP - standard normal air">atmospheric pressure</a> (<a href="pressure-d_587.html" title="Pressure">gauge pressure</a>) are indicated below.</p> <ul> <li><a href="propane-vapor-pressure-d_1020.html" title="Propane - vapor pressure">propane vapor pressure (abs)</a></li> <li><a href="#butane_vapor_pressure_absolute" title="Butane - vapor pressure">butane vapor pressure (abs)</a></li> </ul> <div class="center"> <table class="large"><caption>Propane Butane Mixture - Evaporation Pressure</caption> <thead> <tr><th rowspan="3">Liquid Mixture</th><th colspan="6">Vapor Pressure (<i>psig</i>) <input class="addBar" value="(bar)" style="font-style: italic; color: blue; font-size: 0.8em; cursor: pointer;" type="button" ></th></tr> <tr><th>Propane <br >(C<sub>3</sub>H<sub>8</sub>) <br > <i>(%)</i></th><th>100</th><th>70</th><th>50</th><th>30</th><th>0</th></tr> <tr><th style="width: 14%;">Butane <br >(C<sub>4</sub>H<sub>10</sub>) <br > <i>(%)</i></th><th style="width: 14%;">0</th><th style="width: 14%;">30</th><th style="width: 14%;">50</th><th style="width: 14%;">70</th><th style="width: 14%;">100</th></tr> </thead> <tbody> <tr> <td rowspan="16">Temperature <br > (<i><sup>o</sup>F</i>)<br > <input class="addCelsius" value="(deg C)" style="font-style: italic; color: blue; font-size: 0.8em; cursor: pointer;" type="button" ></td> <td class="fahrenheit">-44</td> <td class="psig">0</td> <td class="psig">0</td> <td class="psig">0</td> <td class="psig">0</td> <td class="psig">0</td> </tr> <tr> <td class="fahrenheit">-30</td> <td class="psig">6.8</td> <td class="psig">0</td> <td class="psig">0</td> <td class="psig">0</td> <td class="psig">0</td> </tr> <tr> <td class="fahrenheit">-20</td> <td class="psig">11.5</td> <td class="psig">4.7</td> <td class="psig">0</td> <td class="psig">0</td> <td class="psig">0</td> </tr> <tr> <td class="fahrenheit">-10</td> <td class="psig">17.5</td> <td class="psig">9</td> <td class="psig">3.5</td> <td class="psig">0</td> <td class="psig">0</td> </tr> <tr> <td class="fahrenheit">0</td> <td class="psig">24.5</td> <td class="psig">15</td> <td class="psig">7.6</td> <td class="psig">2.3</td> <td class="psig">0</td> </tr> <tr> <td class="fahrenheit">10</td> <td class="psig">34</td> <td class="psig">20.5</td> <td class="psig">12.3</td> <td class="psig">5.9</td> <td class="psig">0</td> </tr> <tr> <td class="fahrenheit">20</td> <td class="psig">42</td> <td class="psig">28</td> <td class="psig">17.8</td> <td class="psig">10.2</td> <td class="psig">0</td> </tr> <tr> <td class="fahrenheit">30</td> <td class="psig">53</td> <td class="psig">36.5</td> <td class="psig">24.5</td> <td class="psig">15.4</td> <td class="psig">0</td> </tr> <tr> <td class="fahrenheit">40</td> <td class="psig">65</td> <td class="psig">46</td> <td class="psig">32.4</td> <td class="psig">21.5</td> <td class="psig">3.1</td> </tr> <tr> <td class="fahrenheit">50</td> <td class="psig">78</td> <td class="psig">56</td> <td class="psig">41</td> <td class="psig">28.5</td> <td class="psig">6.9</td> </tr> <tr> <td class="fahrenheit">60</td> <td class="psig">93</td> <td class="psig">68</td> <td class="psig">50</td> <td class="psig">36.5</td> <td class="psig">11.5</td> </tr> <tr> <td class="fahrenheit">70</td> <td class="psig">110</td> <td class="psig">82</td> <td class="psig">61</td> <td class="psig">45</td> <td class="psig">17</td> </tr> <tr> <td class="fahrenheit">80</td> <td class="psig">128</td> <td class="psig">96</td> <td class="psig">74</td> <td class="psig">54</td> <td class="psig">23</td> </tr> <tr> <td class="fahrenheit">90</td> <td class="psig">150</td> <td class="psig">114</td> <td class="psig">88</td> <td class="psig">66</td> <td class="psig">30</td> </tr> <tr> <td class="fahrenheit">100</td> <td class="psig">177</td> <td class="psig">134</td> <td class="psig">104</td> <td class="psig">79</td> <td class="psig">38</td> </tr> <tr> <td class="fahrenheit">110</td> <td class="psig">204</td> <td class="psig">158</td> <td class="psig">122</td> <td class="psig">93</td> <td class="psig">47</td> </tr> </tbody> </table> </div> <ul> <li><i>1 psi (lb/in<sup>2</sup>) = 144 psf (lb<sub>f</sub>/ft<sup>2</sup>) = 6894.8 Pa (N/m<sup>2</sup>) = 6.895x10<sup>-3</sup> N/mm<sup>2</sup> = 6.895x10<sup>-2</sup> bar</i></li> </ul> <p>Note that the evaporation temperature is not the only parameter that influences on evaporation of the propane butane mixture. Evaporation requires heat and if the heat transferred to the liquid gas is limited - the liquid cools down and the evaporation is  reduced.</p> <ul> <li>Larger consumers requires heat exchangers fueled with hot water, electric heater or combustion of the propane butane mix itself to supply the evaporation heat.</li> <li>Smaller consumers requires propane butane mix containers with efficient heat transfer from the surroundings. By example - composite containers provides less heat transfer compared to steel containers and may cause problems at lower surroundings temperatures.  </li> </ul> <div id="adInContent1" class="noPrint"> <div>  <div id="adngin-incontent1-0"></div> </div> </div> <h3>Propane Butane Mix Vapor Diagram - <i>psig</i></h3> <p class="center"><img src="https://www.engineeringtoolbox.com/docs/documents/1043/propane-butane-mix-vapor-pressure-diagram.png" alt="Propane butane mix - vapor diagram - imperial units - psig" title="Propane butane mix - vapor diagram - imperial units - psig" style="display: block; margin-left: auto; margin-right: auto;" width="451" height="418" ></p> <h3></h3> <h3>Propane Butane Mix Vapor Diagram - <i>bar</i></h3> <p class="center"><img src="https://www.engineeringtoolbox.com/docs/documents/1043/propane-butane-mix-vapor-pressure-diagram-pa.png" alt="Propane butane mix - vapor diagram - metric units - bar" title="Propane butane mix - vapor diagram - metric units - bar" style="display: block; margin-left: auto; margin-right: auto;" width="451" height="418" ></p> <div id="adInContent2" class="noPrint"> <div>  <div id="adngin-incontent2-0"></div> </div> </div> <h3><a id="butane_vapor_pressure_absolute"></a>Butane Vapor Pressure (abs)</h3> <table class="x-small"><caption>Butan Vapor Pressure</caption> <thead> <tr><th style="width: 50%;">Temperature <br ><em>(<sup>o</sup>C)<br > <input class="addFahrenheit" value="(deg F)" style="font-style: italic; color: blue; font-size: 0.8em; cursor: pointer;" type="button" ></em></th><th style="width: 50%;">Vapor Pressure<br ><em>(bar abs)<br > <input class="addPsia" value="(psia)" style="font-style: italic; color: blue; font-size: 0.8em; cursor: pointer;" type="button" ></em></th></tr> </thead> <tbody> <tr> <td class="celsius">-101.5</td> <td class="barabs">0.0013</td> </tr> <tr> <td class="celsius">-77.8</td> <td class="barabs">0.013</td> </tr> <tr> <td class="celsius">-59.1</td> <td class="barabs">0.053</td> </tr> <tr> <td class="celsius">-44.2</td> <td class="barabs">0.13</td> </tr> <tr> <td class="celsius">-16.3</td> <td class="barabs">0.53</td> </tr> <tr> <td class="celsius">-0.5</td> <td class="barabs">1.01</td> </tr> <tr> <td class="celsius">18.8</td> <td class="barabs">2.03</td> </tr> <tr> <td class="celsius">50.0</td> <td class="barabs">5.07</td> </tr> <tr> <td class="celsius">79.5</td> <td class="barabs">10.1</td> </tr> <tr> <td class="celsius">116</td> <td class="barabs">20.3</td> </tr> </tbody> </table> </div> <div id="adSlotDoc2" class="noPrint"> <div>  <div id="adngin-doc2-0"></div> </div> </div> <h2> Related Topics </h2> <ul> <li> <h3> <a href="combustion-boiler-fuels-t_9.html" title="combustion fuel temperature coal oil alternative flame temperature boiler chimney gas diesel efficiency engine controls additives price furnace butane propane lpg mine automation"> Combustion </a> </h3> Combustion processes and their efficiency. 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