Noun
- 1. hydrogen, H, atomic number 1, chemical element, element, gas
- usage: 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
- 2. henry, H, inductance unit
- usage: 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
- 3. Planck's constant, h, factor of proportionality, constant of proportionality
- usage: the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
- 4. H, h, letter, letter of the alphabet, alphabetic character
- usage: the 8th letter of the Roman alphabet
- 5. heat content, total heat, enthalpy, H, physical property
- usage: (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"
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