Loschmidt constant

From Wikipedia, the free encyclopedia

In chemistry and physics, the Loschmidt constant (symbol:n₀) is the number density of particles (atoms or molecules) of an ideal gas at standard temperature and pressure.^[1]

n₀ = RT/p = (2.686 7773 ± 0.000 0047)×10²⁵ m⁻³ (CODATA 2002 value)

It is named after the Austrian chemist Johann Josef Loschmidt, who first calculated its value in 1865.^[2]

The term Loschmidt constant is also sometimes (incorrectly) used to refer to the Avogadro constant, particularly in German texts. The Loschmidt constant and the Avogadro constant are related by

N_A = n₀p/k_BT

[edit] References

1. ^ National Institute of Standards and Technology (February 2006). Fundamental physical constants: Physico-chemical constants. Retrieved on 2006-12-28.
2. ^ Bader, Alfred; Parker, Leonard. "Joseph Loschmidt, Physicist and Chemist". Physics Today Online (March 2001). Retrieved on 2006-12-28.