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从稳恒理想流体的柏努利方程推导来看,是在流体中任取一小流管中的一小液段,对这小段流动的液体应用功能原理便可推导出柏努利方程。在公式推导过程中,所用的物理知识和数学知识都是中学内容,比较容易接受。但对公式中各项的物理意义有不同的理解,主要集中在对P这个物理量的争论上,其实质是对方程的理解存在分岐,那么究竟怎样理解柏努利方程呢? 对P的理解,一般书籍、讲义上都定义为单位体积的压强(或压力)能;但也有人提出这样定义是错误的,应叫压强功;还有的干脆就叫压强。各自都有道理。
From the Bernoulli equation of the steady ideal fluid, it is to take a small liquid segment in a small flow tube. The Bernoulli equation can be derived by applying the functional principle to the liquid flowing in this small segment. In the course of formula derivation, both the physical and mathematical knowledge used are secondary contents and are relatively easy to accept. However, there are different understandings on the physical meanings of each item in the formula, mainly focusing on the debate on the physical quantity of P. The essence of this is the disagreement on the understanding of equations. How to understand the Bernoulli equation? To understand P, General books, handouts are defined as the pressure (or pressure) per unit volume of energy; but it was also suggested that such a definition is wrong, should be called pressure work; others simply called pressure. Each makes sense.