# Ratio of specific heats

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 January 12, 1999, 19:44 Ratio of specific heats #1 jay Guest   Posts: n/a Folks, Can anyone tell me the value of gamma (Cp/Cv) for: Ammonia (NH3), and Carbon Dioxide (CO2) and Carbon Monoxide (CO) Thanks in advance. -Jay

 January 13, 1999, 00:06 Re: Ratio of specific heats #2 Glenn Horrocks Guest   Posts: n/a Jay, The gamma for: CO2 = 1.289 CO = 1.400 (at 300K) From Fundamentals of Classical Thermodynamics by Van Wylan & Sonntag. I don't seem to be able to find NH3. Its Cp is 2.158 kJ/kgK at 300K, that's the best I can do. (From Fundamentals of Heat and Mass Transfer by Incropera and De Witt) Maybe try the SI Chemical Data Book? Regards, Glenn

 January 13, 1999, 05:40 Re: Ratio of specific heats #3 Jens I. Madsen Guest   Posts: n/a I could not find the ratio of specific heats (gamma) for NH3 in a table either, but the value is easily deductable if you recall your basic thermodynamics: R= Cp-Cv gamma = Cp/Cv Combining these expressions, gamma can be computed from quantities that I did find, namely those for Cp and R. gamma = Cp/(Cp-R) Cp = 2219 J/kgK (at 20 deg. Celsius) R = 488,3 J/kgK => gamma = 1.28 Table values where taken from "Bosnjakovic: Technische Thermodynamik"

 January 13, 1999, 10:50 Re: Ratio of specific heats #4 jay Guest   Posts: n/a Glenn and Jens, Many thanks for your replies, and for the references both of you provided. Best, -Jay.

 January 13, 1999, 12:20 Re: Ratio of specific heats #5 Erwin Platvoet Guest   Posts: n/a Ratio of specific heats ammonia = 1.310 carbon dioxide = 1.304 carbon monoxide = 1.404 at 15 deg.C and 1 atm. Source: Perry's Chem. Eng. Handbook, table 3-185

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