| Noun | 1. | H - 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 universetritium - a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter H2O, water - binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent gas - a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely |
| 2. | H - 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 inductance unit - a measure of the property of an electric circuit by which an electromotive force is induced in it abhenry - a unit of inductance equal to one billionth of a henry millihenry - a unit of inductance equal to one thousandth of a henry | |
| 3. | h - the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second constant of proportionality, factor of proportionality - the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality | |
| 4. | h - the 8th letter of the Roman alphabet Latin alphabet, Roman alphabet - the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters" | |
| 5. | H - (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"physical property - any property used to characterize matter and energy and their interactions thermodynamics - the branch of physics concerned with the conversion of different forms of energy |