British thermal unit, n.
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
<noun.quantity>
B.Th.U. BTU British thermal unit
Word
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
<noun.quantity>
B.Th.U. BTU British thermal unit