H

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
   同义词：hydrogen, atomic number 1
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
   同义词：henry
3. the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
   同义词：Planck's constant
4. the 8th letter of the Roman alphabet
   同义词：letter h
5. (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure
   同义词：heat content, total heat, enthalpy