Glossary “heat treatable alloy” Definition:
Any substance whose strength will not be affected by the application of a controlled amount of heat. Usually refers to metals, such as alloys of aluminum or iron (steel).

Glossary “heat treatment” Definition:
Sequence of controlled heating and cooling operations applied to a solid metal to provide the desired properties.

Glossary “heat sink” Definition:
1). A finned, aluminum housing that dissipates heat and serves as a base on which electrical components, such as semiconductor devices, are mounted. 2). A heat dissipating section of the alternator that holds the insulated diodes or all the diodes, and carries heat away from the devices.

Glossary “heat sink compound” Definition:
A paste that can be applied to parts during welding to absorb heat and prevent warpage.

Glossary “heat tab” Definition:
A small aluminum disk attached to the cylinder head or block having a lead center designed to melt at 260¡ãF, to indicate if the engine has been overheated.

Glossary “heat transfer” Definition:
Movement of heat from a hotter to a colder area by conduction, convection, or radiation.

Glossary “heat treatable” Definition:
Metal alloy that can be hardened by heat treatment after being shaped.

Glossary “heat riser” Definition:
A channel in an intake manifold through which exhaust gas flows in order to heat the manifold, thus aiding in fuel vaporization.

Glossary “heat riser valve” Definition:
Control valve between the exhaust manifold and exhaust pipe that restricts the flow of exhaust, causing it to flow back through the heat-riser channel under the intake manifold. It acts as an aid to fuel evaporation and to speed engine warm-up.

Glossary “heat setting” Definition:
Determines the length of the arc when MIG welding.

Glossary “heat shrink tubing” Definition:
Tubing that shrinks to seal electrical joints when heated.

Glossary “heat quantity” Definition:
1). Amount of heat as measured on a thermometer. 2). Amount of heat contained in an object measured in Btu’s or calories.

Glossary “heat radiation” Definition:
Transmission of heat from one substance to another while passing through, but not heating, intervening substances.

Glossary “heat range” Definition:
Measurement of a spark plug’s ability to transfer heat from the tip of the insulator into the cylinder head.

Glossary “heat load” Definition:
The “load” imposed on an A/C system. due to ambient temperature, humidity, and all other factors that produce unwanted heat.

Glossary “heat of compression” Definition:
An increase of temperature brought by the compression of gas, air, or an air/fuel mixture.

Glossary “heat of fusion” Definition:
Amount of latent heat, in Btu, required to cause a change of state from a solid to a liquid.

Glossary “heat exchanger” Definition:
Apparatus in which heat is transferred from one medium to another on the principle that heat moves to an object with less heat.

Glossary “heat induced ignition” Definition:
See preignition.

Glossary “heat intensity” Definition:
Measurement of heat concentration with a thermometer.