- Industry: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
Heat added to a material which changes its physical state, but does not change its temperature. When a pan of water is put on a hot stove and heat is added to it, its temperature rises — but in standard conditions, only until it reaches 100°C. Heat which changes the temperature of water is called sensible heat.
If additional heat is added to the water, it will boil away, or change from liquid water into water vapor, but its temperature will not change. Heat added to water after it begins to boil is called latent heat — more correctly, latent heat of evaporation, or latent heat of vaporization. When water vapor is cooled until it condenses into liquid water, the latent heat which caused the evaporation is given up by the water and absorbed by the surrounding air.
Industry:Aviation
Heat energy added to a material that causes it to change its temperature, but not its physical state. The other kind of heat is latent heat, which causes a material to change its physical state but not its temperature.
When a pan of water is put on a hot stove, sensible heat enters it until the water reaches a temperature of 100°C (under standard conditions). At this temperature, the water begins to boil, or change its physical state from liquid to gas without increasing its temperature. Heat added to the water after it begins to boil is called latent heat.
Industry:Aviation
Heat energy added to a refrigerant after it changes from its liquid state into a vapor. The thermal expansion valve in a refrigeration system meters just enough liquid refrigerant into the evaporator for all of it to be changed from droplets of liquid into a vapor by the time it reaches the end of the evaporator coils. If all of the refrigerant vaporizes before it reaches the end of the coils, any additional heat raises its temperature. This additional heat is called superheat.
Industry:Aviation
Heat released during the change of state that occurs when water vapor changes into liquid water.
Industry:Aviation
Heat transmitted in the form of waves of electromagnetic radiation, rather than by conduction or convection. The heat we receive from the sun is a form of radiant heat.
Industry:Aviation
Heavy weights mounted on some of the cheeks of a reciprocating engine crankshaft to absorb torsional vibrations.
The weights are attached to the cheek by small pins that ride in larger holes in the weights. This arrangement allows the weights to rock back and forth as the crankshaft rotates. It is this rocking motion that absorbs the torsional vibrations of the engine.
Industry:Aviation
Heavy, dense cumuliform clouds with considerable vertical development in the form of massive towers. Cumulonimbus develop from cumulus clouds, and the tops of the towers, which are often in the shape of an anvil or massive plume, extend upward for many thousands of feet.
Lightning, thunder, and often hail accompany a cumulonimbus; and virga, precipitation, and low, ragged clouds, called scud, often form under their dark base. Cumulonimbus occasionally produce tornadoes or waterspouts.
Industry:Aviation
Helical grooves cut onto the surface of a bolt or screw. Mating threads are cut into the inside of a nut. The threads inside the nut match the threads on the outside of the bolt, and the nut is turned down over the threads of the bolt to produce a clamping action that holds parts of a machine together. A threaded bolt is a form of inclined plane.
Industry:Aviation
Helically wound steel-wire springs used to close the poppet valves in the cylinders of an aircraft reciprocating engine. Almost all aircraft engines use more than one spring to close each of the valves.
Industry:Aviation
High usage, locally repairable components such as aircraft wheels, tires, avionics assemblies, propellers, and built-up engines.
Industry:Aviation
