A heat-emitting unit for the heating of room air; it has a heating element surrounded by a cabinet-type enclosure with openings below and above for entrance and egress of air.
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PLENUM SYSTEM
A heating or air conditioning system in which air is forced through a plenum chamber for distribution to ducts.
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PLASTICATE
To soften a material by heating or kneading. Also known as plastify.
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PERIODIC KILN
A kiln in which the cycle of setting ware in the kiln, heating up, soaking'' or holding at peak temperature for some time, cooling, and removing or drawing'' the ware is repeated for each batch.
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PASSIVE SOLAR SYSTEM
A solar heating or cooling system that operates by using gravity, heat flows, or evaporation rather than mechanical devices to collect and transfer energy.
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NERNST-LINDEMANN CALORIMETER
A calorimeter for measuring specific heats at low temperatures, in which the heat reservoir consists of a metal of high thermal conductivity such as copper, to promote rapid temperature equalization; none of the material under study is more than a few millimeters from a metal surface, and the whole apparatus is placed in an evacuated vessel and heated by current through a platinum heating coil.
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MICROWAVE OVEN
An oven that uses microwave heating for fast cooking of meat and other foods.
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MALLORY BONDING
Hermetically sealing polished silicon chips to polished glass plates by placing the two pieces together, heating them to about 350 C (662 F), and applying approximately 8000 volts across the assembly.
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LOW HEAT VALUE
The heat value of a combustion process assuming that none of the water vapor resulting from the process is condensed out, so that its latent heat is not available. Also known as lower heating value; net heating value.
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KATA THERMOMETER
An alcohol thermometer used to measure low velocities in air circulation, by heating the large bulb of the thermometer above 100 F (38 C) and noting the time it takes to cool from 100 to 95 F (38 to 35 C) or some other interval above ambient temperature, the time interval being a measure of the air current at that location.
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JET MOLDING
Molding method in which most of the heat is applied to the material to be molded as it passes through a nozzle or jet, rather than in a conventional heating cylinder.
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