15. Gas Constants
(under standard conditions)
Gas
Relative
molecular
mass
Cp
V
Heat conductivity
mW
Viscosity
11, ftPa•8
Molecular
diameter
d, nm
Van der Weals
constants
atm• 12
a,
b, mol
m•K
molt
He
4
1.67
141.5
18.9
0.20
-Ar
40
1.67
16.2
22.1
0.35
1.30
0.032
H2
2
1.41
188.4
8.4
0.27
0.24
0.027
Na
28
1.40
24.3
16.7
0.37
1.35
0.039
02
32
1.40
24.4
19.2
0.35
1.35
0.032
CO2
44
1.30
23.2
14.0
0.40
3.62
0.043
H2O
18
1.32
15.8
9.0
0.30
5.47
0.030
Air
29
1.40
24.1
17.2
0.35
-No e. This table quotes the mean values of molecular diameters.
When performing more accurate calculations, it should be remembered
that the values of d obtained from the coefficients of viscos ty, heat
conductivity, and diffusion, as well as the Van der Waals constant b,
differ perceptibly from one another.
16. Some Parameters of Liquids and Solids
Substance
Specific heat
capacity *
c,
Specific heat of
vaporization **
q, J/g
Specific heat of
melting
q, J/g
Surface
tension *
mN/m
g•K
Water
4.18
2250
73
Glycerin
2.42
66
Mercury
0.14
284
490
Alcohol
2.42
853
22
Aluminum
0.90
321
Iron
0.46
270
Ice
2.09
333
Copper
0.39
175
Silver
0.23
88
Lead
0.13
25
* Under standard conditions.
** Under standard atmospheric pressure.
s .s