fps units

• 1. 

  N-PLURAL an Imperial system of units based on the foot, pound, and second as the units of length, mass, and time. For scientific and most technical purposes these units have been replaced by SI units 英尺磅秒单位制; 一种用英尺、磅、秒分别作为长度、重量和时间的度量单位的英制单位体系; 因科学和技术方面的原因，已被国际单位制取代