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temperature of all the thermocouples will rise uniformly and since there is no temperature difference
between the thermocouples, there will be no fire warning.
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thermodynamic horsepower. The power that would be produced by a turboprop engine under
standard-day sea-level conditions if the engine were run at a maximum turbine inlet temperature.
thermodynamics. The branch of physics that deals with mechanical actions caused or controlled by heat.
thermoelectricity. The flow of electrons caused by heat in a metal or in a junction of two metals. The
current flowing in a thermocouple circuit is a form of thermoelectricity.
thermograph (meteorology). A continuously recording thermometer.
thermometer. An instrument used to measure temperature. Some thermometers measure the change in the
volume of a liquid caused by its expansion or contraction with changes in its temperature. Others measure
the change in pressure of a confined gas as its temperature changes.
Electrical thermometers measure the current produced in a thermocouple as the temperature
difference between the thermocouple junctions changes, and resistance thermometers measure temperature
by measuring the current forced by a constant voltage through a resistance that changes with the
temperature.
thermonuclear action. The release of energy that takes place when the nucleus of one element is changed
into the nucleus of another element by the action of heat.
thermopile. An assembly of thermocouples connected together. These thermocouples can be connected in
series to get a higher voltage or in parallel to get a larger amount of current. Thermopiles are used to
measure temperature or to change electromagnetic radiant energy into electrical power.
thermoplastic material. A type of plastic material that becomes soft when it is heated, and hardens when it
is cooled. Thermoplastic materials can be softened and hardened many times without the strength or quality
of the material being affected. Transparent acrylic plastic resin is an example of a thermoplastic material.
thermosetting material. A type of plastic material that, when once hardened by heat, cannot be softened
by being heated again. Phenolic resin is an example of a thermosetting material.
thermostat. A temperature-sensitive electrical switch. A thermostat is used with a combustion heater to
control the temperature of the air inside the cabin of an aircraft. The thermostat contains an electrical
switch that closes when the temperature drops to a preset value.
Current flowing through the closed switch opens the heater fuel valve, allowing the heater to begin
heating the air. When the cabin air temperature rises to the upper value for which the thermostat is set, the
switch opens, and the fuel valve shuts off the flow of fuel to the heater.
thermostatic bypass valve (reciprocating engine lubricating system component). A
temperature-sensing valve in an oil cooler that opens when the oil is cold and allows it to flow around the
core of the cooler, between the core and the cooler jacket. When the oil is hot, the bypass valve closes and
forces the oil to flow through the core of the cooler.
thermostatic expansion valve (air conditioning system component). The component in a vapor-cycle
cooling system that meters the refrigerant into the evaporator. The amount of refrigerant metered by the
thermostatic expansion valve, or TXV, is determined by the temperature and pressure of the refrigerant as it
leaves the evaporator coils. The TXV changes the refrigerant from a high-pressure liquid into a spray of
low-pressure liquid.
thermoswitch. An electrical switch that closes a circuit when it is exposed to a specified high temperature.
thickness gage. A precision measuring tool made of a series of narrow strips of steel. Each strip is ground
to an accurate thickness with the thickness marked on each gage. Thickness gages are used to measure the
clearance, or the distance between parts, by finding the thickest gage that can be slipped between them.
thinner (finishing system component). A solvent mixed with a finishing material, such as lacquer, dope,
or enamel, to reduce its viscosity so it can be sprayed.
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third-class lever. A lever in which the force is applied between the fulcrum and the weight. The force
needed to move the weight is greater than the weight, but the distance moved by the weight is greater than
that moved by the force.
thixotropic agent (plastic resin component). A material, such as microballoons, added to a resin to give it
body and increase its workability.
thorium. A heavy, silvery-white, malleable, metallic chemical element. Thorium’s symbol is Th, its atomic
　
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