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The gas constant occurs in the ideal gas law: where P is the absolute pressure, V is the volume of gas, n is the amount of substance, m is the mass, and T is the thermodynamic temperature. Rspecific is the mass-specific gas constant. The gas constant is expressed in the same unit as molar heat.
The gas constant is a physical constant denoted by R and is expressed in terms of units of energy per temperature increment per mole. It is also known as the ideal gas constant or molar gas constant or universal gas constant.
In the imperial system the most common units for the individual gas constant are ft lb/slug o R . In the SI system the most common units are J/kg K . Unit conversion: 1 J/kg K = 5.97994 ft lb/slug °R, and 1 ft lb/slug °R = 0.167226 J/kg K.
Gas Constant Value in Different Units. In 2019, the redefinition of several SI base units included the gas constant. The gas constant is now defined as precisely 8.31446261815324 J⋅K −1 ⋅mol −1. However, many different gas constant values exist, depending on the desired units.
The four gas variables are: pressure (P), volume (V), number of mole of gas (n), and temperature (T). Lastly, the constant in the equation shown below is R, known as the the gas constant, which will be discussed in depth further later: PV = nRT. Another way to describe an ideal gas is to describe it in mathematically.
The volume (V) occupied by n moles of any gas has a pressure (P) at temperature (T) in Kelvin. The relationship for these variables, PV = nRT (1) (1) P V = n R T. where R is known as the gas constant, is called the ideal gas law or equation of state.
Definition of the universal gas constant (R) frequently used in ideal gas equations, along with gas constant values for different units.