Month: May 2019

Today the SI (Système international d’unités) base units are redefined. The following are now exact. Memorize these numbers! Cs-133 transition frequency constant  defines the second. Then light speed constant  defines the meter. Then Planck’s constant  defines the kilogram. Then electron charge constant  defines the Ampere. Then Boltzmann’s constant  defines the Kelvin. And Avogadro’s constant  defines the mole. And luminous efficacy constant  defines…