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Glossary of Terms - All Terms

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Glossary Subsets

Hall Effect Sensor

A feedback device, commonly used in brushless motors, that provides information for the amplifier to electronically commutate the motor. The sensors generate commutation signals by sensing the position of a magnetized wheel on the rotor.


Ripples on the sine wave that can cause vibration or excessive heat to be generated in the lines and panels. Mathematically, any multiple of the fundamental frequency.


The height of a column of fluid above a set point. Head is often used to indicate gauge pressure. The pressure is equal to the height times the density of the fluid.


The process of heating parts to a high temperature and then quenching them, either in oil, water, air, or another solution.


A form of energy that has the capacity to increase the temperature of a substance. Any energy that is wasted or used to overcome friction is converted to heat. Heat is measured in calories or British Thermal Units (BTUs). One BTU is the amount of heat required to raise one pound of water one degree Fahrenheit.

Heat Exchanger

A device which transfers heat through a conducting wall from one fluid to another fluid.

Hertz (Hz)

A unit of frequency equal to one cycle per second.

Hot Melt

An adhesive which is in a molten state when it is applied, and forms a bond when cooled.

Housing Fit

The amount of interference or clearance between a bearing, seal or components outside diameter and the housing bore.

Horsepower (HP)

The power required to lift 550 pounds one foot in one second or 33,000 pounds one foot in one minute. A horsepower is equal to 746 watts or to 2544 BTU's per hour.

Hot Tack

A characteristic of hot melts in that they have holding power even while in the liquid hot state.

Hydraulic Balance

A condition of equal opposed hydraulic forces acting on a part in a hydraulic component.

Hydraulic Control

A control which is actuated by hydraulically induced forces.


Engineering science pertaining to liquid pressure and flow. Also referred to as hydrodynamics.

Hydraulic Nut

A collar temporarily fixed to a shaft which incorporates a hydraulic piston to transmit axial mounting or dismounting force.


Greek word for water.


Engineering science pertaining to liquid pressure and flow. Also referred to as hydraulics.


The decomposition of a substrate by reaction with water.


Engineering science pertaining to the energy of liquids at rest.