The unit of power is “horsepower” has been used for hundreds of years. But what is this unit and where did it come from? James watt suggested to Breweries instead of horses to use the power of steam. Watching the horses, watt observed that a horse could drag a weight 14,774 kg at a distance of 0.3 m in 1 minute. Rounding 14,774 kg to 15 kg, he introduced a unit of power is “horsepower”. Comparing the performance of the horse and the steam engine with the help of this unit, watt had convinced the brewers to replace the horses in pairs, and as a result, the efficiency of the brewing process has increased significantly. And the term “horsepower” has been since that time widely used.