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11 Φεβ 2021 · 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 molar gas constant (also known as the gas constant, universal gas constant, or ideal gas constant) is denoted by the symbol R or R. It is the molar equivalent to the Boltzmann constant, expressed in units of energy per temperature increment per amount of substance, rather than energy per temperature increment per particle.
Definition of the universal gas constant (R) frequently used in ideal gas equations, along with gas constant values for different units.
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.
Universal gas constant (R), fundamental physical constant arising in the formulation of the ideal gas law. The constant is the same for all gases, provided that the mass of gas being compared is one mole, or one molecular weight in grams. The value of R is 8.314462618 joules per kelvin per mole.
The induvidual gas constant, R, for a gas can be calculated from the universal gas constant, R u ( given in several units below ), and the gas molecular weight, M gas : R = R u /M gas [1] In the imperial system the most common units for the individual gas constant are ft lb/slug o R .
In SI units the value of the gas constant, R, is: R =8.314510 Pa m3 K-1 mol-1 = 8314.510 Pa L K-1 mol-1 = 0.08314510 bar L K-1 mol-1. This table gives the appropriate value of R for use in the ideal gas equation, PV = nRT, when the variables are expressed in other units.
