WordWeb Online

1. The 8th letter of the Roman alphabet
   - H
    
2. The constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
   - Planck's constant

1. (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure
   "H is the amount of energy in a system capable of doing mechanical work";
   - heat content, total heat, enthalpy
    
2. A nonmetallic univalent element that is normally a colourless and odourless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
   - hydrogen, atomic number 1
    
3. 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
   - henry

Derived forms: hs, Hs

Type of: alphabetic character, chemical element, constant of proportionality, element, factor of proportionality, gas, inductance unit, letter, letter of the alphabet, physical property

Part of: H2O, Latin alphabet, Roman alphabet, water

Encyclopedia: H