noun. a unit of energy equal to the work done by a power of 1000 watts operating for one hour.
noun. 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.
1. Noun, singular or mass If the steam flow is 1,000 pounds per hour, then the total heat input per hour is 794,000 btu.
