Ideal gas law
p V = n R T {\displaystyle pV=nRT} where p {\displaystyle p}, V {\displaystyle V} and T {\displaystyle T} are the pressure, volume and temperature respectively; n {\displaystyle n} is the amount of substance; and R {\displaystyle R} is the ideal gas constant.It can also be derived from the microscopic kinetic theory, as was achieved (apparently independently) by August Krönig in 1856 and Rudolf Clausius in 1857.
combination:two_responses, oulipo:avoid_letter[t]