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.
- synonyms: hydrogen, 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.
- synonyms: henry
- The constant of proportionality relating the energy of a photon to its frequency; approximately 6. 626 x 10-34 joule-second.
- synonyms: Planck's constant
- The 8th letter of the Roman alphabet.
- Thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure. (
- usage: "enthalpy is the amount of energy in a system capable of doing mechanical work"
- synonyms: heat content, total heat, enthalpy
WordNet 3.0 © 2006 by Princeton University
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