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.

synonyms: atomic number 1, hydrogen.

Dutch: hydrogeen, hydrogenium, waterstof
Polish: H, wodór

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.

synonym: henry.

Dutch: henry
Polish: H, henr

The constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second.

synonym: Planck's constant.

The 8th letter of the Roman alphabet.

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.

synonyms: enthalpy, heat content, total heat.

Dutch: enthalpie
Polish: entalpia