What does BTU stand for?

Question

im doing a research paper on hydroelectric power and i have to compare the number of BTUs compared to other energy sources (coal, wood, etc.) first answer gets the 10 pts.

thanks!

Answer 1

and officially  Btul because British is capitalized and the rest not.

Answer 2

British thermal unit

Answer 3

BTU+ British Thermal Unit

""A BTU is defined as the amount of heat required to raise the temperature of one pound of liquid water by one degree Fahrenheit. Melting a pound of ice at 32 °F requires 143 BTU. As is the case with the calorie, several different definitions of the BTU exist, which are based on different water temperatures and therefore vary by up to 0.5%:""

There is a chart with numerical equivalents on this page:

http://en.wikipedia.org/wiki/BTU