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

[ Syn: hydrogen , hydrogen , h , h , atomic number 1 , atomic number 1 ]

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

[ Syn: henry , h ]

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

[ Syn: plancks constant ]

the 8th letter of the Roman alphabet

[ Syn: h , h , h , h ]

(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

[ Syn: heat content , total heat , enthalpy , h ]