A unit of force in the foot-pound-second system of measurement,equal to the force required to accelerate a standard one-pound mass one foot per second per second(approximately0.138 newton).

• 磅达英尺－磅－秒制中力的单位，相当于使1磅的自由质量得到一英尺每秒加速度的力（大约等于0.；138牛顿每秒）。