Alternative form of Dirac constant.

Alternative form of Planck's constant

(logic) A word or phrase which has an invariant logical meaning and which is useful for forming argument forms.

Describing a universal joint that allows constant power to be transmitted through a variable angle

(physics) The physical constant relating energy at the particle level with temperature observed at the bulk level. It is the gas constant R divided by the Avogadro's number N_A:- k=R/(N_rm A),

(mathematics) A constant that maintains the same value wherever it occurs; such as π. / Used other than figuratively or idiomatically: see absolute, constant.

(crystallography) The constant distance between unit cells in a crystal lattice. It may be different in each direction, thus a crystalline substance may have up to three lattice constants.

(mathematics, chiefly historical) Synonym of pi

(mathematics) A transcendental real constant, denoted by C₁₀, whose decimal expansion has important properties.

(chemistry, physics) The number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³. By definition, the number of elementary entities (atoms or molecules) comprising one mole of a given substance.