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British thermal unit

(Encyclopedia)British thermal unit, abbr. Btu, unit for measuring heat quantity in the customary system of English units of measurement, equal to the amount of heat required to raise the temperature of one pound of...

thermal unit

(Encyclopedia)thermal unit: see British thermal unit. ...

thermal capacity

(Encyclopedia)thermal capacity: see heat capacity. ...

thermal pollution

(Encyclopedia)thermal pollution: see water pollution. ...

astronomical unit

(Encyclopedia)astronomical unit (AU), mean distance between the earth and sun; one AU is c.92,960,000 mi (149,604,970 km). The astronomical unit is the principal unit of measurement within the solar system, e.g., M...

atomic mass unit

(Encyclopedia)atomic mass unit or amu, in chemistry and physics, unit defined as exactly 1⁄12 the mass of an atom of carbon-12, the isotope of carbon with six protons and six neutrons in its nucleus. One amu is e...

European Currency Unit

(Encyclopedia)European Currency Unit: see European Monetary System. ...

Btu

(Encyclopedia)Btu: see British thermal unit.

British Empire

(Encyclopedia)British Empire, overseas territories linked to Great Britain in a variety of constitutional relationships, established over a period of three centuries. The establishment of the empire resulted primar...

British Library

(Encyclopedia)British Library, national library of Great Britain, located in London; one of the world's great libraries. Long a part of the British Museum, the library collection originated in 1753 when the governm...