h.

英 美
  • [医]普朗克氏量子常数
  • h n.英语字母表的第八个字母氢的化学符号.abbr.(铅笔心)硬的(=hard)
  • md abbr.医学博士(=DoctorofMedicine)
名词 h:
  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

  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

  3. the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10%5E-34 joule-second

  4. the 8th letter of the Roman alphabet

  5. (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure