World - Italiano - Regionale - H
Look up H in dictionary
H
n 1: 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}, {H}, {atomic number 1}]
2: 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}]
3: the constant of proportionality relating the energy of a
photon to its frequency; approximately 6.626 x 10^-34 joule-
second [syn: {Planck's constant}, {h}]
4: the 8th letter of the Roman alphabet [syn: {H}, {h}]
5: (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}]
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