Encyclopedia of Environmental Science and Engineering, Volume I and II

1338 APPENDIX

TABLE 9

CP/CV: Ratios of specific heats of gases at 1 atm pressure

Compound Formula Temperature,°C

Ratio of

specific heats

(γ) = Cp/Cv Compound Formula Temperature, °C

Ratio of specific

heats (γ) = Cp/Cv

Acetaldehyde C 2 H 4 O3 (^0) 1.14 Hydrogen (contd.)
Acetic acid C 2 H 4 O 2 136 1.15 cyanide HCN 65 1.31
Acetylene C 2 H 2 15 1.26 — —^140 1.28
 (^71) 1.31 — — 210 1.24
Air —^925 1.36 iodide HI 20 – 200 1.40
(^17) 1.403 sulfide H 2 S1 (^5) 1.32
 (^78) 1.408 —— (^45) 1.30
 118 1.415 —— 57 1.29
Ammonia NH 3 15 1.310 Iodine I 2 185 1.30
Argon A1 5 1.668 Isobutane C 4 H 10 15 1.11
 180 1.76 Krypton Kr 19 1.68
0 – 100 1.67 Mercury Hg 360 1.67
Benzene C 6 H 6 90 1.10 Methane CH 4 600 1.113
Bromine Br 2 20 – 350 1.32 — —^300 1.16
Carbon dioxide CO 2 15 1.304 ——1^5 1.31
 (^75) 1N.37 —— 80 1.34
disulfide CS 2 100 1.21 ——^115 1.41
monoxide CO^15 1.404 Methylacetate C 4 H 6 O 2 15 1.14
 (^180) 1.41 alcohol CH 4 O 77 1.203
Chlorine Cl 2 15 1.355 ether C 2 H 6 O 6 – 30 1.11
Chloroform CHCl 3 100 1.15 Methylal C 3 H 8 O 2 13 1.06
Cyanogen (CH) 2 15 1.256 —^40 1.09
Cyclohezane C 6 H 12 80 1.08 Neon Ne^19 1.64
Dichlorodifluoro-
methane
CCl 2 F 2 25 1.139 Nitric oxide NO 15 1.400
Ethane C 2 H 6 100 1.19 ——^45 1.39
(^15) 1.22 —— (^80) 1.38
 (^82) 1.28 Nitrogen N 2 15 1.404
Ethyl alcohol C 2 H 6 O9^0 1.13 ——^181 1.47
ether C 4 H 10 O3^5 1.08 Nitrous oxide N 2 O^100 1.28
(^80) 1.086 — — 15 1.303
Ethylene C 2 H 4 100 1.18 ——^30 1.31
(^15) 1.255 —— (^70) 1.34
 (^91) 1.35 Oxygen O 2 15 1.401
Helium He  180 1.660 —— 76 1.415
Hexane(n-) C 6 H 14 80 1.08 —— 181 1.45
Hydrogen H 2 15 1.410 Pentane(n-) C 5 H 12 86 1.086
 76 1.453 Phosphorus P 300 1.17
 181 1.597 Potassium K 850 1.77
bromide HBr 20 1.42 Sodium Na 750 – 920 1.68
chloride HCl^15 1.41 Sulfur dioxide SO 2 15 1.29
(^100) 1.40 Xenon Xe (^19) 1.66
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