Glossary “Hz” Definition:
Hertz, a frequency of one cycle per second.
h
hypoid gear
Glossary “hypoid gear” Definition:
The combination of a ring gear and a pinion gear in which the pinion meshes with the ring gear below the centerline of the ring gear. Commonly used in automotive final drives and starter motors.
hypoid gear lubricant
Glossary “hypoid gear lubricant” Definition:
An extreme pressure lubricant designed for severe operation of hypoid gears. It is rated by its GL number.
hysteresis bands
Glossary “hysteresis bands” Definition:
The area between two curves on a graph that indicates when a torque converter locks and unlocks. Hysteresis bands exist between graph curves that indicate when a transmission will upshift or downshift.
Hyundai
Glossary “Hyundai” Definition:
Hope You Understand Nothing’s Driveable And Inexpensive
hypertext
Glossary “hypertext” Definition:
A special type of a database system, in which objects ( text, pictures, music, programs, and so on ) can be creatively linked to each other.
hyperlink
Glossary “hyperlink” Definition:
An element in an electronic document that links to another place in the document or to an entirely different document.
hydrophilic
Glossary “hydrophilic” Definition:
Attraction to water.
hydroplane
Glossary “hydroplane” Definition:
The action of a tire rolling on a layer of water on the road surface instead of staying in contact with the pavement. Hydroplaning occurs when water cannot be displaced from between the tread and the road.
hydrostatic lock
Glossary “hydrostatic lock” Definition:
When a liquid is trapped in a blind hole, the fastener comes in contact with the liquid, it can not compress the liquid, results in improper torque being applied to the fastener. Damage to the surrounding material may occur.
hydrostatic pressure
Glossary “hydrostatic pressure” Definition:
Pressure exerted by a fluid.
hygroscopic
Glossary “hygroscopic” Definition:
Readily absorbing and retaining moisture.
hydrofluorocarbon
Glossary “hydrofluorocarbon” Definition:
A man-made compound used in refrigerants, such as R-134a.
hydrogen
Glossary “hydrogen” Definition:
A colorless, odorless flammable gas.
hydrolocked engine
Glossary “hydrolocked engine” Definition:
When coolant, fuel, or any liquid in a cylinder prevent an engine crankshaft from turning over.
hydrolyzing action
Glossary “hydrolyzing action” Definition:
Corrosive action within the air-conditioning system induced by a weak solution of hydrochloric acid formed by excessive moisture chemically reacting with the refrigerant.
hydrometer
Glossary “hydrometer” Definition:
Instrument used to measure the specific gravity of a liquid. A battery hydrometer is calibrated to read the expected specific gravity of the batteries electrolyte.
hydrocarbon reactivity
Glossary “hydrocarbon reactivity” Definition:
Measurement of the smog-forming potential of a hydrocarbon.
Hydrocarbons
Glossary “Hydrocarbons” Definition:
Any number of compounds of carbon and hydrogen used as fuel, such as gasoline
hydrochloric acid
Glossary “hydrochloric acid” Definition:
Corrosive acid produced when water and R-12 are mixed as within an automotive A/C system.