- British thermal unit(the amount of heat needed to raise one pound of water by one degree Fahrenheit, equal to 1.055 x 103 joules)
英国热量单位(将一磅水提高1华氏度所需的热量,等于1.055 x 103焦耳) World energy use in 1970 was about 200 quadrillion Btu. 1970年世界能源使用量约为200万亿Btu。