A surname from German.

(physics) Used attributively in the names of various units, formulae etc. first devised or worked on by the German physicist Max Planck (1858–1947), chiefly in the realm of quantum theory.

plural of Planck

(physics) the constant of proportionality (symbol h), relating the energy and frequency of a photon (6.626 × 10⁻³⁴ joule-seconds); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action

(physics) The fundamental upper limit of temperature conceivable under current models of physics, in which all matter is accelerated as quickly as possible to the speed of light, approximately 1.41679 × 10³² kelvins.

(physics) A unit of length, believed to be the smallest length that has physical meaning, that is defined in terms of the speed of light, the gravitational constant and the reduced Planck's constant, namely: ℓ_P=√hbar Gc³≈1.616 252(81)⨯10⁻³⁵ mbox meters

Synonym of Planck epoch

plural of Planck unit

(physics) A natural unit of energy, equivalent to the mass energy of a Planck particle (m_Pc²) or the energy per quantum at a temperature of one Planck temperature (kT_P).

(physics) A hypothetical particle having physical quantities on the Planck scale, most importantly being one Planck mass in mass.