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转速的国际单位是rpm还是r min？？为什么这么多机器上标的是rpm?_百度知道
转速的国际标准单位为rps （转 秒）或 rpm （转 分），也有表示为RPM (转 分 ，主要为日本和欧洲采用，我国采用国际标准)。机器上标rpm，是因为它是国际标准单位。 转速 (Rotational Speed或Rev)是做圆周运动的物体单位时间内沿圆周绕圆心转过的圈数（与频率不同）。常见的转速有额定转速和最大转速等
RPM（转速单位，表示每分钟转数）_百度百科
RPM是Revolutions Per Minute的缩写，即转每分，表示设备每分钟的旋转次数。
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