A unit of energy or work equal to 10,000,000 ergs. It is the work done or energy expended by a force of 1 newton acting through a distance of 1 meter.

【理】焦耳。能或功的绝对单位，略作 J，等于一千万尔格；其定义为为用一牛顿力把物体移动一公尺所需要的能量。