British thermal unit

The British thermal unit (BTU or Btu) is a non-metric unit of energy, used in the United States and, to a lesser extent, the UK (where it is

Related Topics:
Energy - United States - UK

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

generally only used for heating systems). The SI unit is the joule (J), which is used by most other countries. A BTU is defined as the amount of heat required to raise the temperature of one pound avoirdupois of water by one degree Fahrenheit; specifying the temperature range over which this happens leads to a number of slightly different BTU values, varying over a range of about 0.5%:

Related Topics:
SI - Joule - Pound avoirdupois - Water - Fahrenheit

~ ~ ~ ~ ~ ~ ~ ~ ~ ~