The U.S. Energy Information Administration recently published a short reference article on the British thermal unit. Btu is a common measure of the energy content of various sources of energy, and natural gas often is priced in terms of million Btu. But what is a Btu?
“One Btu is the amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit,” the EIA explains. How much is that? About the energy emitted from a single wooden kitchen match when lit, the EIA says.