English Reference Dictionary Lookup


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Defintion of atomic number 1, H, hydrogen. (n):
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.

Defintion of enthalpy, H, heat content, total heat. (n):
(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".

Defintion of H, henry. (n):
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.

Defintion of h, Planck's constant. (n):
The constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second.

Defintion of H, h. (n):
The 8th letter of the Roman alphabet.

Defintion of H, h. (n):
The 8th letter of the Roman alphabet.