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IEVref:113-02-17ID:
Language:enStatus: Standard
Term: Boltzmann constant
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Symbol: k
kB
Definition: conventional physical constant which relates the thermodynamic temperature and energy, the value of which is set to 1,380 649 × 10−23 J/K

Note 1 to entry: The Boltzmann constant relates the average kinetic energy E of particles in an ideal gas to the thermodynamic temperature T of the gas as follows:

E= 3 2 kT MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqipu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyraiabg2da9maalaaabaGaaG4maaqaaiaaikdaaaGaam4Aaiaadsfaaaa@3AF9@ .

Note 2 to entry: The Boltzmann constant is used in the SI to define the kelvin.


Publication date:2020-12
Source:SI Brochure, 9th edition, 2019, 2.2, modified – The definition in the SI Brochure has been revised to comply with the IEV rules.
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