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noun. The constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second.

noun. (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure.

noun. A nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe.

noun. A unit of inductance in which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second.