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Chapter

Chapter

# Properties of Gases and Vapors

DOI link for Properties of Gases and Vapors

Properties of Gases and Vapors book

# Properties of Gases and Vapors

DOI link for Properties of Gases and Vapors

Properties of Gases and Vapors book

## ABSTRACT

The first quantitative data regarding the behavior of gases were reported by Robert Boyle in 1662. He showed that at any given temperature, the product of the pressure

P

exerted by a gas and its molar volume

v

is constant. In 1787, Jacques Charles observed that this constant is a function of temperature. Thus, the equation of state for one mole of a gas was determined to be

Pv = f

(

t

) (2.2)

It was found that

f

(

t

) was approximately linear:

f

(

t

) =

a

+

bt

. The constants

a

and

b

were estimated from experimental data. In units of liters per mole and atmospheres, an expression for

f

(

t

) was determined:

f(t)

= 22.4140 + 0.082057

t

= 0.082057 (273.16 +

t

) (2.3)

where

t

is the temperature in degree Celsius (or Centigrade). This expression can be rewritten if a new temperature scale is adapted such that

T

= 273.16 +

t

°

C. We then have, for one mole of a gas,

Pv = RT

(2.4)

where

T

is the absolute temperature and

R

is the universal gas constant whose numerical value depends on the choice of units. Table 2.1 gives the values of

R

in different sets of units.