Gas or Vapor

Formula

Molar Mass

M g/mol

Specific Heat

C_V kJ/kg×K

Ratio of Specific Heats

Z₀

km

Z₁

km

Hydrogen

H₂

2

10.16

1.41

168.6

215.9

Helium

He

4

3.12

1.66

66.3

107.7

Ammonia

NH₃

17

1.66

1.32

23.6

27.5

Hydroxyl

OH

17

1.27

1.41

21.1

27.0

Water Vapor

H₂O

18

1.46

1.32

21.4

24.2

Neon

Ne

20

0.62

1.66

13.0

21.1

Acetylene

C₂H₂

26

1.37

1.23

17.0

16.3

Nitrogen

N₂

28

0.74

1.40

12.1

15.3

Carbon Monoxide

CO

28

0.72

1.40

11.8

14.9

Air

29

0.72

1.40

11.9

14.9

Nitric Oxide

NO

30

0.72

1.38

11.4

14.1

Oxygen

O₂

32

0.66

1.39

10.6

13.3

Argon

Ar

40

0.31

1.67

6.6

10.8

Propylene

C₃H₆

42

1.31

1.15

13.2

10.2

Propane

C₃H₈

44

1.48

1.13

13.9

10.0

Carbon Dioxide

CO₂

44

0.65

1.29

9.1

9.8

Nitrous Oxide

N₂O

44

0.69

1.27

9.3

9.7

Butane

C₄H₁₀

58

1.53

1.09

11.8

7.1

Sulfur Dioxide

SO₂

64

0.51

1.25

6.6

6.6

Chlorine

Cl₂

71

0.36

1.33

5.4

6.2

Xenon

Xe

131

0.10

1.65

2.0

3.3