1. R = universal molar gas constant (J/mol K

2. R is called the universal gas constant, and it is R is 8. 31 joules per mole- Kelvin.

3. For unit mass, the equation is pV = RT, where p is the pressure; V, the volume; R, the gas constant; and T the temperature (absolute).

4. Using the standard sea level conditions of # a and # °C and the gas constant for dry air # the air density D may be calculated as