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);

In the Newtonian model, for any finite nonzero units of spatial length and temporal duration, c0 is infinitely large. In the modern Relativistic/Einsteinian paradigm of physics, c0 is a finite positive number for any finite nonzero units of spatial length and temporal duration; thus, in such cases, we can set it equal to 1 (begin measuring in terms of percentage of c0) and gain scaled Relativistic results; by Maxwellian electromagnetism, c0 = 299792458 m/s. Notice the lack of reference to the speed of light and of media through which the wave/particle propagates. This is a physical constant of a universe; any entities of zero mass in a universe will propagate at c0 in an ideal perfect vacuum/classical free space - we just happen to name three such entities "light", "gravitation", and "the strong nuclear force". See also: plankexu, gravnutnoia, boltsemaku, avgadro, ocnerta.

- 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). - boltsemaku
- 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) - 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) - impetu
- x
_{1}is the momentum [vector] of x_{2}in frame of reference x_{3} - nejnimpetu
- x
_{1}is the linear-momentum-energy-mass [four-vector] of x_{2}in frame of reference x_{3} - ocnerta
- x
_{1}is a physically-required conserved quantity in an ideal closed system such that it is associated with (Noetherian) symmetry/Hamiltonian-commuting observable/deterministic feature/law/property/aspect x_{2}, applicable under conditions/in universe/in metaphysics x_{3} - 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) - velsudu
- x
_{1}has a speed of x_{2}space units covered in x_{3}time period; x_{1}has the magnitude of velocity measured by x_{2}(space units) traversed in time x_{3}(event)