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| bismuth |
a chemical element that has eighty-three protons in each nucleus and is a white brittle crystalline metal with very low thermal and electrical conductivity, used chiefly in alloys and medicines. (symbol: Bi) |
| Btu |
abbreviation of "British thermal unit" or "British thermal units," a unit of heat equal to the amount needed to raise the temperature of one pound of water one degree Fahrenheit, or equal to about 252 calories. |
| diffusion |
a mixing of molecules of different substances, that results from random thermal motion. [1/3 definitions] |
| Johnson noise |
the thermal background noise heard on a radio receiver. |
| lagging |
thermal insulation that is wrapped around pipes, boilers, and the like. [1/3 definitions] |
| perlite |
a volcanic glass with distinctive concentric cracks, used in the manufacture of concrete and plaster, and thermal and acoustic insulation. |
| phonon |
a quantum of sound or vibrational energy that is used to calculate the thermal and vibrational properties of solids. (Cf. photon.) |
| quad5 |
a unit of energy equal to one quadrillion British thermal units. |
| superfluidity |
the condition of liquid helium below 2.18 degrees Kelvin, characterized by frictionless flow and very high thermal conductivity. |
| thermic |
of, pertaining to, or resulting from heat; thermal. |
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