Avogadrova konstanta: 201 let počítání molekul
Klíčová slova:Avogadrova konstanta, látkové množství, XRCD, historie chemie, SI soustava jednotek
A brief history of molecule counting in the last two centuries is described. The story started with early determinations of the Avogadro constant by Loschmidt and others and ends for the time being with its modern spectroscopic determinations. The relation of high-precision Avogadro constant measurements to modern metrology is discussed in the context of recent suggestions of reforms in the SI unit system.