Glossary - H

Heat.   The total kinetic energy of the molecules of any substance.

Henry.  The basic unit of inductance, symbolized with the letter H. An electric circuit has an inductance of one henry when current changing at the rate of one ampere per second induces a voltage of one volt into the circuit.

Hermaphrodite caliper.   Generally used as a marking gauge in layout work. It should not be used for precision measurement.

Hidden lines.   Indicates invisible edges or contours.

Horsepower.   A measure of power equal to 550 footpounds per second or 33,000 foot-pounds per minute and 746 Watts.

Hot start.   Occurs when the engine starts, but the exhaust gas temperature exceeds specified limits. This is usually caused by an excessively rich fuel/air mixture entering the combustion chamber.

Humidity.   The amount of water vapor in the air.

Hung start.   Occurs when the engine starts normally, but the rpm remains at some low value rather than increasing to the normal starting rpm. This is often the result of insufficient power to the starter, or the starter cutting off before the engine starts self-accelerating.

Hydrometer.   A device used for measuring the specific gravity of liquids.

Hydrometer.   An instrument for determining the specific gravity of liquids.

Hypotenuse.   The side of a right triangle that is opposite the right angle. The hypotenuse is the longest side of a right triangle.

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