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Glossary of terms used on this site

There are 823 entries in this glossary.
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Term Definition
Half Bridge

Two active elements or strain gages.


One way at a time data communication; both devices can transmit and receive data, but only one at a time.


An interface procedure that is based on status/data signals that assure orderly data transfer as opposed to asynchronous exchange.


Output in a permanent form (usually a printout) rather than in temporary form, as on disk or display terminal.


Resistance of metal to plastic deformation, usually by indentation. Resistance of plastics and rubber to penetration of an indentor point into its surface.


The electrical, mechanical and electromechanical equipment and parts associated with a computing system, as opposed to its firmware or software.

Head Loss

The loss of pressure in a flow system measured using a length parameter (i.e., inches of water, inches of mercury).

Head Pressure

Pressure in terms of the height of fluid, P = yrg, where r = fluid density and y = the fluid column heights. Expression of a pressure in terms of the height of fluid, r = yrg, where r is fluid density and y = the fluid column height. g = the acceleration of gravity.


Thermal energy. Heat is expressed in units of calories or BTU's.

Heat Sink
  1. Thermodynamic. A body which can absorb thermal energy. 2. Practical. A finned piece of metal used to dissipate the heat of solid state components mounted on it.
Heat Transfer:

The process of thermal energy flowing from a body of high energy to a body of low energy. Means of transfer are: conduction; the two bodies contact. Convection; a form of conduction where the two bodies in contact are of different phases, i.e. solid and gas. Radiation: all bodies emit infrared radiation.

Heat Treating

A process for treating metals where heating to a specific temperature and cooling at a specific rate changes the properties of the metal.

Hertz (Hz)

Units in which frequency is expressed. Synonymous with cycles per second.

Hertz (Hz.)

A unit of measurement that measures how often a periodic event, such as a waveform, occurs. One hertz equals one cycle per second. Frequency is often measured in kilohertz (KHz, 1000Hz), megahertz (MHz, 1000 KHz), gigahertz (GHz, 1000MHz), or terahertz (THz, 1000 GHz).


Refers to a base sixteen number system using the characters 0 through 9 and A through F to represent the values. Machine language programs are often written in hexadecimal notation.

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