Irodov – Problems in General Physics

15. Gas Constants

(under standard conditions)

Gas

Relative

molecular

mass

Cp

V

Heat con-

ductivity

mW

Viscosity

11, ftPa•8

Molecular

dia-

meter

d, nm

Van der Weals

constants

a, atm• 1^2 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

0 2 32 1.40 24.4 19.2 0.35 1.35 0.032

CO 2 44 1.30 23.2 14.0 0.40 3.62 0.043

H (^2) O 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 *

g•K mN/m

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.

n. n