Thermodynamic Properties of Vapors from Speed of Sound

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td align="left" rowspan="2">Substance</td><td align="center" colspan="3">RD [%]</td></tr><tr class="thead"><td align="center"><span style="width: 12.375px;"><svg height="11.6" id="M128" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 12.375 11.6" width="12.375" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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<g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path d="M383 397q0 -32 -35 -49q-12 -6 -23 8q-37 45 -84 45t-90 -71q-40 -65 -40 -167q0 -57 22 -86t59 -29q38 0 81.5 24.5t69.5 51.5l16 -21q-44 -53 -104 -84t-109 -31q-56 0 -89.5 41t-33.5 117q0 61 30 124t79 105q33 28 81 50.5t86 22.5q34 0 59 -15.5t25 -35.5z" id="x1D450"></path></g>
<g transform="matrix(.012,-0,0,-.012,6.962,11.762)"><path d="M457 332q0 -81 -41 -161.5t-105.5 -131.5t-129.5 -51q-46 0 -79 30.5t-33 86.5q0 18 7 51q18 95 46 187q6 19 6 33q0 7 -7 7q-24 0 -78 -64l-20 23q32 48 73 77t78 29q33 0 33 -46q0 -38 -10 -70q-28 -92 -39 -152q-7 -38 -7 -57q0 -78 69 -78q68 0 118 75.5t50 194.5
q0 43 -12 57q-11 12 -11 24q0 19 15 35.5t34 16.5q18 0 30.5 -34.5t12.5 -81.5z" id="x1D463"></path></g>
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</svg></span></td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td align="left">Ar</td><td align="center">+0.0014<br/>−0.0001</td><td align="center">+0.0012<br/>−0.0532</td><td align="center">+0.0016<br/>−0.0801</td></tr><tr><td align="left">N<sub>2</sub></td><td align="center">+0.0025<br/>−0.0000</td><td align="center">+0.0135<br/>−0.0875</td><td align="center">+0.0142<br/>−0.1085</td></tr><tr><td align="left">CH<sub>4</sub></td><td align="center">+0.0021<br/>−0.0004</td><td align="center">+0.0352<br/>−0.0482</td><td align="center">+0.0361<br/>−0.0787</td></tr><tr><td align="left">CO<sub>2</sub></td><td align="center">+0.0018<br/>−0.0003</td><td align="center">+0.0073<br/>−0.0211</td><td align="center">+0.0074<br/>−0.0562</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

The maximum RD in the subcritical domain.

Journal of Thermodynamics

tab4

Table 4

Table 4: Thermodynamic Properties of Vapors from Speed of Sound 