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h

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

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

noun: the 8th letter of the Roman alphabet

noun: (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure; "enthalpy is the amount of energy in a system capable of doing mechanical work"