a unit of heat equal to the amount of heat required to raise one pound of water one degree Fahrenheit at one atmosphere pressure; equivalent to 251.997 calories
[ Syn: british thermal unit , btu , b.th.u. ]
a unit of heat equal to the amount of heat required to raise one pound of water one degree Fahrenheit at one atmosphere pressure; equivalent to 251.997 calories
[ Syn: british thermal unit , btu , b.th.u. ]