人们谈论汽车时常常谈到马力,在大多数割草机上都有一个标有额定马力的大标签。但什么是马力?额定马力就性能来说是什么意思?马力这个术语是工程师詹姆斯·瓦特发明的。瓦特(1736—1819)因改进蒸汽机的性能而出名。当我们每次谈到60瓦特的灯泡时,总能想到他。据说瓦特在煤矿工作时常用马来拉煤,他想用一种方法来表示每匹马可提供的动力。他发现,一匹采矿的马平均1分钟内可以做29832牛顿·米的功。然后他增加了50% People talk about horsepower when talking about cars, and on most lawn mowers there is a big label with a nominal horsepower. But what is horsepower? What is the meaning of nominal horsepower in terms of performance? The term horsepower was invented by engineer James Watt. Watts (1736-1819) is famous for improving the performance of steam engines. Always think of him every time we talk about a 60 watt light bulb. It is said that Watt used malay coal frequently in coal mines and wanted to use a method to express the power each horse could provide. He found that a mining horse could do 29,832 Newton-meters of work a minute on average. Then he added 50%