therm

1

In the United States, a quantity of 1000 cubic feet of natural gas at standard temperature and pressure.

2

Convert between the therm (Europe) and other major units of energy.

In the European Community, a legally-defined¹ unit of energy, equal to 100,000 Btu_IT, exactly 1.055 06 × 10⁸ joules. This unit is also used by engineers in the United States.

In the United Kingdom, the therm was abolished effective 31 December 1999.

1. Council Directive of 20 December 1979. Council of the European Communities.

Dept. of Scientific and Industrial Research.
The Therm.
London: H. M. Stationery Office, 1922.

3

Convert between the therm (US) and other major units of energy.

In the natural gas industry in the United States, a legally-defined¹ unit of energy, equal to 100,000 Btu_(59°F), exactly 1.054 804 × 10⁸ joules.

1. Federal Register of July 27, 1968.

4

An obsolete synonym for the calorie. The B.A. Committee itself renamed the unit "calorie" in 1896, at the Liverpool meeting (Twenty-Third Report — Liverpool, 1896.

sources

At the last meeting of the Committee it was resolved, on the motion of Mr W. H. Preece, to adopt the name “Therm” for the Gramme-Water Degree Centigrade Unit of Heat. Thus one “Therm” is the quantity of heat required to raise one gramme of water at its maximum density one degree Centigrade.

Fifteenth Report- Bath, 1888.
Reports of the Committee on Electrical Standards Appointed by the British Association for the Advancement of Science.
Cambridge: Cambridge Univ. Press, 1913.
Page 342.