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Online Physics Glossary / Terms / Dictionary

Physics Definitions Start from H

Hadron - The attraction of mass to all other mass. Gravity is the weakest known force in nature at normal energies.

Heavy ion - The nucleus of a large atom, such as gold, with more or fewer electrons than usual, or no electrons at all.

Hertz - Abbreviated Hz. A unit of frequency equal to one cycle per second. One kHz = 1000 Hz. One MHz = 106 (one million) Hz. One GHz = 109 Hz.

Hydromagnetic Wave - A wave in which both the plasma and magnetic field oscillate.

Half-life - Length of time for half of a sample of radioactive material to decay.

Harmonics - Frequencies produced by musical instrument that are multiples of fundamental tone.

Heat - Quantity of energy transferred from one object to another because of a difference in temperature.

Heat Engine - Device that converts thermal energy to mechanical energy.

Heat of Fusion - Quantity of energy needed to change a unit mass of a substance from solid to liquid state at the melting point.

Heat of Vaporization - Quantity of energy needed to change a unit mass of a substance from liquid to gaseous state at the boiling point.

Heavy Water - Deuterium oxide used mainly in CANDU nuclear reactors.

Heisenberg Uncertainty Principle - The more accurately one determines the position of a particle, the less accurately the momentum can be known, and vice versa.

Hole - Absence of an electron in a semiconductor.

Hooke’s Law - Deformation of an object is proportional to force causing it.

Huygens’ Wavelets - Model of spreading of waves in which each point on wavefront is source of circular or spherical waves.

Hydraulic System - Machines using fluids to transmit energy.

Hyperbola - Mathematical curve that describes an inverse relationship between two variables.

Hypotenuse - Side opposite the right angle in a triangle.

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