**Definition:**The Gas Constant is the constant in the equation for the Ideal Gas Law:

PV = nRT

where P is pressure, V is volume, n is number of moles, and T is temperature.

The value of the gas constant 'R' depends on the units used for pressure, volume and temperature.

R = 0.0821 liter·atm/mol·K

R = 8.3145 J/mol·K

R = 8.2057 m^{3}·atm/mol·K

R = 62.3637 L·Torr/mol·K or L·mmHg/mol·K**Also Known As:** Ideal Gas Constant