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 (synset 114664612)
  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 (synset 113660884)
  3. The constant of proportionality relating the energy of a photon to its frequency;
    Approximately 6.626 x 10^-34 joule-second (synset 113612326)
  4. The 8th letter of the Roman alphabet (synset 106844976)
  5. (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure (synset 105019456)
    "enthalpy is the amount of energy in a system capable of doing mechanical work"

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