Becquerel: the SI unit of radioactivity Becquerel The becquerel (Bq) is the SI derived unit of radioactivity, defined as one nuclear decay per second. This article explains its meaning, relation to decay laws, multiples, uses, mea…
Boltzmann constant The Boltzmann constant (k or kB) links microscopic energy to macroscopic temperature. It has the exact SI value 1.380649×10⁻²³ J·K⁻¹ and underpins statistical mechanics and thermod…
Centimetre–gram–second (CGS) system of units Centimetre-gram-second system of units An overview of the centimetre–gram–second (CGS) system: base units, common derived measures (dyne, erg, barye), electrical variants, history, conversions and how CGS differs from S…
