Symbol NL. The number of particles per unit volume of an ideal gas at STP. It has the value 2.686 763(23)×1025 m−3 and was first worked out by the Bohemian physical chemist Josef Loschmidt (1821–95) in 1865.
Chemistry
The number of particles per unit volume of an ideal gas at s.t.p. It has the value 2.686 7811(15)×1025 m−3 and was first worked out by Joseph Loschmidt (1821–95) in 1865.