tritium - 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

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

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

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"

physical property - a property used to characterize physical objects

thermodynamics - the branch of physics concerned with the conversion of different forms of energy