Question

what is universal gas constant​

Answer 1

It is a physical constant that is featured in many fundamental equations in the physical sciences, such as the ideal gas law, the Arrhenius equation, and the Nernst equation. ... As a consequence, the value of the gas constant is also exactly defined, at precisely 8.31446261815324 J⋅K−1⋅mol−1.

Answer 2

The gas constant is denoted by the symbol R or R. It is equivalent to the Boltzmann constant, but expressed in units of energy per temperature increment per mole, i.e. the pressure–volume product, rather than energy per temperature increment per particle.