很多同学在学习了压强公式P=F/S和P=ρgh之后,对两者关系以及解题时公式的选择存在一定的困惑。在此,我浅谈一下两公式的关系及应用,希望同学们能理解掌握,熟练应用。公式P=F/S是压强的定义式,也是决定式,无论固体、液体,还是气体,它都适用。但要特别强调公式中F表示的是垂直作用在受力面积S After many students learned the pressure formulas P=F/S and P=ρgh, there was some confusion about the relationship between the two and the choice of formulas for solving problems. Here, I talk about the relationship and application of the two formulas. I hope that the students can understand and master the application. The formula P=F/S is the definition of pressure and it is also the decisive formula. It applies to solids, liquids, and gases. However, it is important to emphasize that F in the formula indicates that the vertical force acts on the force area S.