Page 473 - Introduction to Continuum Mechanics

Principle of Conservation of Energy 457

Or,

that is

In view of Eq. (ii), this equation becomes

We note here that this is the same energy equation derived in Chapter 6 (Example 6.28.1)
using differential forms of energy equation for an inviscid nonheat-conducting fluid. From
Eqs. (ii)(iv) and (x) we obtain