x_{1} is the Boltzmann k_{B} constant linking energy with temperature [approximately equal to: 1.380 6488(13)×10^{−23} J/K], expressed in units x_{2} (default: unitless/dimensionless and equal to 1) in paradigm/system/metaphysics/universe x_{3} (default: this, our actual, physical universe)

Introduced by Planck (along with "h", his own eponymous constant); named after Boltzmann who nonetheless laid the foundation for research into such affairs. See also: stefanboltsemasi (sigma_{SB}), plankexu, tcelerita, gravnutnoia, avgadro, ocnerta, nejni, kelvo, nilgla.

- avgadro
- x
_{1}is Avogadro constant N_{A}[ approximately equal to: 6.02214129(27)×10^{23}mol^{−1}], expressed in units x_{2}in paradigm/system/metaphysics/universe x_{3}(default: this, our actual, physical universe) - entropi
- x
_{1}(amount) is the entropy of system x_{2}under conditions/in macrostate x_{3}, where the entropy is of type/calculated via formula x_{4}. - gravnutnoia
- x
_{1}is Newton's constant of universal gravitation/G/big G [approximately equal to: 6.67×10^{(−11)}N·(m/kg)^{2}] expressed in units x_{2}(default: unitless/dimensionless and equal to 1) in paradigm/system/metaphysics/universe x_{3}(default: this, our actual, physical universe) - plankexu
- x
_{1}is the elementary unit (quantum) of angular momentum/half of Planck's reduced constant [id est: hbar/2 = h/(4 pi)] expressed in units x_{2}(default: unitless/dimensionless and so that it is equal to 1) in paradigm/system/metaphysics/universe x_{3}(default: this, our actual, physical universe) - stefanboltsemasi
- x
_{1}is the black-body Stefan-Boltzmann sigma_{SB}constant [approximately equal to: 5.670373(21)×10^{(−8)}W/(m^{2}×K^{4})], expressed in units x_{2}(default: unitless/dimensionless and equal to pi^{2 / 480}) in paradigm/system/metaphysics/universe x_{3}(default: this, our actual, physical universe) - tcelerita
- x
_{1}(number; default: 1) is the physical speed supremum (for objects of positive masses)/celeritas/c_{0}expressed in units x_{2}(default: in terms of natural parameter c_{0}; id est: unitless/dimensionless and equal to 1) in (paradigm/system of) physics x_{3}(default: this, our actual. physical universe and reality);