我们总是希望物理量的计量单位既容易理解,又便于测量还要方便计算。瓦特在改良蒸汽机使之可以实用,选择了“马力”作为功率单位是容易理解的一个典型。这个单位形象地说明了蒸汽机能顶几匹马做功,虽然测量和计算都不方便,却一直为人们沿用至今。在工程技术中,把力的单位选择为“公斤力”“吨力”,是容易测量的一个典型。质 We always hope that the unit of measurement of physical quantities is easy to understand, but also easy to measure but also easy to calculate. Watt was able to use the improved steam engine to make it practical. Selecting “horsepower” as a power unit is a typical example. This unit vividly illustrated that the steam engine functions on top of several horses. Although measurements and calculations are not convenient, they have been used by people for a long time. In engineering technology, choosing the unit of force as “kg force” and “ton force” is a typical example of easy measurement. quality