دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a measure of heat energy equivalent to the amount of heat needed to raise 1 pound of water 1ﾰF at or near its point of maximum density (39.1ﾰF). Equivalent to 0.252 kilogram- calorie or 1,055 joules.

British Thermal Unit.

n: the amount of heat energy necessary to raise the temperature of I gram of water 10 Celsius. It is the metric equivalent of the British thermal unit.

n pi: the amount of heat required to raise the temperature of 1 kilogram of water 1�C.

n: the amount of heat required to cause a unit increase in temperature in a unit mass of a substance, expressed as numerically equal to the number of calories needed to raise the temperature of I gram of a substance by 1�C.