British Thermal Unit (Btu or BTU or BThU) 01
British Thermal Unit (Btu or BTU or BThU) 01 : A unit of heat energy defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. In America the British thermal unit is sometimes called the?heat unit. In defining the Btu, it is necessary to specify the temperature of the water; thus there have been several definitions over the years. However, one Btu is equal to about 251.996 (small)?calories, or 0.251 996 of the (kilo-)calories counted by dieters. Using the current definition of the calorie (the IT calorie), one Btu equals approximately 778.169 foot pounds, 1.055 056 kilojoules?or 0.293 071?watt?hour. The symbol?BThU?has also been used, especially in Britain
No records Found