Isobaric specific heat of gases and vapors under standard conditions

Isobaric specific heat of gases and vapors under standard conditions

Junjie Chen

Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China

Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: komcjj@gmail.com

Gases are treated as a large collection of tiny particles subject to the laws of physics. Their properties are attributed primarily to the motion of the molecules and can be explained by the kinetic theory of gases. It is not obvious that this should be the case, and for many years a static picture of gases was instead espoused, in which the pressure, for instance, was attributed to repulsive forces between essentially stationary particles pushing on the container walls. How the kinetic-molecular picture finally came to be universally accepted is a fascinating piece of scientific history and is discussed briefly below in the section Kinetic theory of gases. Any theory of gas behaviour based on this kinetic model must also be a statistical one because of the enormous numbers of particles involved. The kinetic theory of gases is now a classical part of statistical physics and is indeed a sort of miniature display case for many of the fundamental concepts and methods of science. Such important modern concepts as distribution functions, cross sections, microscopic reversibility, and time-reversal invariance have their historical roots in kinetic theory, as does the entire atomistic view of matter.

Gases and vapors, Isobaric specific heat (kilojoules per kelvin per kilogram)

Acetone      1.47

Acetylene      1.69

Air      1.01

Alcohol (ethanol)       1.88

Alcohol (methanol)       1.93

Ammonia      2.19

Argon      0.520

Benzene        1.09

Blast furnace gas      1.03

Bromine      0.25

Butane      1.67

Carbon dioxide      0.844

Carbon monoxide      1.02

Carbon disulphide      0.67

Chlorine              0.48

Chloroform      0.63

Ethane      1.75

Ether (diethyl ether)       1.95

Ethylene      1.53

Helium      5.19

Hydrochloric acid      0.795

Hydrogen      14.32

Hydrogen chloride      0.8

Hydroxyl      1.76

Krypton      0.25

Methane      2.22

Natural gas      2.34

Neon      1.03

Nitric oxide      0.995

Nitrogen      1.04

Nitrogen tetroxide      4.69

Nitrous oxide      0.88

Oxygen      0.919

Propane      1.67

Propene (propylene)       1.5

Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: komcjj@gmail.com, Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China