When the change in Ψ can be ignored, a very useful form of this equation is: v 2 2 + w = w 0 {\displaystyle {\frac {v^{2}}{2}}+w=w_{0}} where w0 is total enthalpy.
當 Ψ {\displaystyle \Psi } 變化可以忽略，一個非常有用的形式的方程式是: v 2 2 + w = w 0 {\displaystyle {v^{2} \over 2}+w=w_{0}} 其中 w 0 {\displaystyle w_{0}} 是焓的總量。