Values of Gas Constant in Ideal Gas Law

Values of Gas Constant in ideal gas law can vary depending on the units used, this short article discuss what is the ideal gas law and provides some common values used for the ideal gas law equation.

What is the Ideal Gas Law?

The Ideal Gas Law States that,

PV= nRT

P= Pressure of Gas
V= Volume of n moles of gas 
n= number of moles of gas, which is also defined as weight/molecular weight
R= Gas Constant
T= Temperature

This equation only works when all the gases are behaving themselves in other word ideal gas state. There is a relationship between Pressure, Volume and Temperature when using this equation. This equation also allows us to approximate the behaviour of gases.  Using this ideal gas we can also determine the weight of a gas if the volume is known and vice-versa.

Parameters	English	Metric	S.I
Pressure	1 atm	1.033 kgf3/cm2	1.01325 bar
Gas Constant	0.73 atm ft3/lb mole oR	0.085 kgf m3/k mole K	0.083 Bar m3/k mole K
Molar Volume	359 ft3/lb mole	22.414 m3/k mole	22.414 m3/k mole
Temperature	492 oR	273 K	273 K

Values of Gas Constant

Gas constant R is universal, a dimensional quantity.

R values depend on the Units involved. The table below summarizes the values used for the gas constant at different measurement units in relation to the ideal gas law.

Temperature	Pressure	Volume	Gas Constant ‘R’	Units of Gas Constant
R	psia	in3	18.51	in3 psia/lb mole R
R	psia	ft3	10.73	ft3 psia/lb mole R
R	atmospheres	ft3	0.73	ft3 atm/lb mole R
R	lbf/ft2	ft3	1545.35	ft lbf/lb mole R
K	Pa	m3	8314	m3 Pa/k mole K
K	atmospheres	m3	0.08206	m3 atm/k mole K
K	atmospheres	cm3	82.06	cm3 atm/g mole K
K	cm Hg	cm3	6239.79	(cm3 cm Hg) g mole K
K	kPa	m3	8.314	kJ/kg mole K
K	Pa	m3	8314.47	J/kg mole K

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