What does the universal gas constant represent?

The universal gas constant, denoted by the symbol R, is a fundamental physical constant that appears in the ideal gas law. It represents the constant ratio of the product of pressure and volume to the absolute temperature for one mole of an ideal gas.12

Expressed by the equation $PV/T=R$, this constant is the same for all gases, provided the quantity of gas is measured in moles. Its dimensions are energy per degree per mole, and its value is approximately 8.314 joules per kelvin per mole. Mathematically, the constant is defined as the product of Avogadro’s number and the Boltzmann constant. While real gases only approximate this ideal behavior—particularly at high pressures or near their liquefaction points—the constant remains a cornerstone for describing the equation of state for gases.12