(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

(physics) The square of the Planck length, thought to be the quantum of area. Symbol is A_P.

(physics, cosmology) The period immediately after the Big Bang, typically viewed at around one Planck time, whereby all forces were unified.

(physics) A natural unit of time, equivalent to the time it takes light to traverse one Planck length; it is the smallest duration of time that has physical meaning.

(physics) Any one of several natural units in a system originally proposed by Max Planck based on universal constants. Symbols for Planck units are the symbol for the physical quantity with a subscript P.

Alternative form of Planck's constant

plural of Planck length

plural of Planck area

plural of Planck particle