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British thermal unit 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. (abbr.: Btu)
thermal barrier the maximum flight speed of a given supersonic aircraft in the atmosphere that is set by aerodynamic heating effects.
thermal pollution the releasing of large quantities of heated air or water that disrupt the local ecological balance.
thermal spring a spring with water that is of a higher temperature than the mean annual temperature of the spring's locale.