The Loschmidt constant or Loschmidt`s number (symbol: n0) is the number of particles (atoms or molecules) of an ideal gas in a given volume (the number density). It is usually quoted at standard temperature and pressure, the 2010 CODATA recommended value is 2.686 7805(24){e|25} per cubic metre at 0 °C and 1 atm and the 2006 CODATA recommended va....