We now equate this work to the total change in energy, kinetic and potential, of the element.
现在我们使这个功等于流体无动能和热能的总能量的改变。
In the circumstances the potential energy turns to kinetic energy.
在这种情况下,势位能就转化成动能。
Potential energy is convertible to kinetic energy.
势能可转化为动能。