(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.

A surname from German.

plural of Planck

(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.

plural of Planck unit

(physics) The velocity equal to one Planck length per Planck time; equal to the speed of light. Symbol is v_P or c.

Synonym of Planck epoch

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

(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) The scale at which quantum-mechanical effects become significant to depicting spacetime & other gravitational phenomena, typically defined as being on the order of one Planck length (~10⁻³⁵ m).