| NOUN | substance | H, hydrogen, atomic number 1 | a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas |
|---|---|---|---|
| quantity | H, henry | 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 | |
| quantity | h, Planck's constant | the constant of proportionality relating the energy of a photon to its frequency | |
| communication | H / h | the 8th letter of the Roman alphabet | |
| attribute | H, heat content, total heat, enthalpy | (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure |
| Sounds | ey'ch | |
|---|---|---|
| Rhymes | mph ... Th: 4 rhymes with eych... | |
| Meaning | 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 | hydrogen, atomic number 1 | |
| Narrower | tritium | A radioactive isotope of hydrogen |
| Broader | 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 |
| gas | A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely | |
| Substance of | water, H2O | binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid / liquid |
| Spanish | hidrógeno, número atómico 1 | |
| Catalan | hidrogen, número atòmic 1 | |
| Meaning | 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 | |
| Parts | abhenry | A unit of inductance equal to one billionth of a henry |
| millihenry | A unit of inductance equal to one thousandth of a henry | |
| Broader | inductance unit | A measure of the property of an electric circuit by which an electromotive force is induced in it |
| Spanish | henrio | |
| Meaning | 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 | |
| Broader | factor of proportionality, constant of proportionality | The constant value of the ratio of two proportional quantities x and y |
| Spanish | constante de Planck | |
| Catalan | constant de Planck | |
| Meaning | The 8th letter of the Roman alphabet. | |
|---|---|---|
| Member of | Roman alphabet, Latin alphabet | The alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe |
| Broader | letter, letter of the alphabet, alphabetic character | The conventional characters of the alphabet used to represent speech |
| Spanish | H | |
| Catalan | h | |
| Meaning | (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure. | |
|---|---|---|
| Synonyms | heat content, total heat, enthalpy | |
| Category | thermodynamics | The branch of physics concerned with the conversion of different forms of energy |
| Broader | physical property | Any property used to characterize matter and energy and their interactions |
| Spanish | entalpía | |
| Catalan | entalpia | |
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