Optical determination of the Boltzmann constant*
Cheng Cun-Feng, Sun Y. R., Hu Shui-Ming†
       
The Boltzmann constant k B determined by different groups using different methods. INRIM: Istituto Nazionale di Ricerca Metrologica (Italy);[ 14 ] LNE: Laboratoire national de métrologie et d’essais (France);[ 12 , 15 ] NPL: National Physical Laboratory (UK);[ 10 , 13 , 16 ] NIM: National Institute of Metrology of China;[ 18 ] NIST: National Institute of Standard and Technology (US);[ 7 , 11 ] PTB: Physikalisch-Technische Bundesanstalt (Germany);[ 6 , 17 ] U-Nap: Seconda Università di Napoli (Italy).[ 19 ]