Therm 1 (thm)
Therm 1 (thm) :
A commercial unit of heat energy. The therm is equal to 100 000 Btu. Because there have been several definitions of the Btu, there are two official definitions of the therm. In the U.S., the legal definition (made in 1968) is that the therm equals 105.4804 megajoules. The European Union's definition, made in 1979 using the more current IT Btu, is 105.5060 megajoules. Either way the therm is equal to about 25 200 (large) calories or about 29.3 kilowatt hours of electrical energy. One therm can also be provided by about 96.7 cubic feet of natural gas. The therm has sometimes been confused with the thermie (see below). The names of both units come from the Greek word for heat, therme
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