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Gas Properties

Fluid Mechanics for Gases

Gas Properties

Gas	k	R ft lb/lb° R	Density		C_P* Btu/lb° R	C_V* Btu/lb° R
Gas	k	R ft lb/lb° R	lb_m/ft³	lb_m/std L	C_P* Btu/lb° R	C_V* Btu/lb° R
H₂	1.40	766.6	0.00532	0.000188	3.420	2.435
He	1.66	386.1	0.01056	0.000373	1.250	0.754
Neon	1.66	76.6	0.0533	0.00188	0.248	0.150
Nat. Gas	1.22	79.2	0.0516	0.00182	0.560	0.45
N₂	1.40	55.2	0.0739	0.00261	0.247	0.17
CO	1.41	55.2	0.0739	0.00261	0.243	0.172
Air	1.40	53.3	0.0764	0.00270	0.241	0.173
Ethane	1.21	51.4	0.0793	0.00280	0.386	0.320
O₂	1.40	48.3	0.0845	0.00298	0.217	0.155
Argon	1.67	38.7	0.1053	0.00372	0.124	0.074
CO₂	1.28	35.1	0.1162	0.00410	0.205	0.160
N₂O	1.26	35.1	0.1162	0.00410	0.221	0.176
SO₂	1.25	24.1	0,1691	0.00597	0.154	0.123
Freon-12	1.13	12.8	0.319	0.01127	0.145	0.129
Xe	1.68	11.74	0.3427	0.0121	0.0383	0.0228

*Values at 68°F and 14.7 psia

\[\text{C}_{\text{P}}=\text{Specific}\ \text{Heat}\ \text{at}\ \text{Constant}\ \text{Pressure}\]

\[\text{C}_{\text{V}}=\text{Specific}\ \text{Heat}\ \text{at}\ \text{Constant}\ \text{Volume}\]

\[\text{k}=\text{Ratio}\ \text{of}\ \text{specific}\ \text{heats:}\ \frac{\text{C}_\text{P}}{\text{C}_\text{V}}\]

\[\text{R}_{\text{O}}=\text{Universal}\ \text{Gas}\ \text{Constant}\]

\[\text{R}=\text{Gas}\ \text{Constant:}\ \frac{\text{R}_\text{O}}{\text{Molecular}\ \text{Weight}\ }\]