plural of Planck

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.

(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) 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).

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.

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