Question

During which phase change (at constant pressure) does water release the most heat energy?

Answer 1

During the transition `"vapour"rarr"liquid"`........

Explanation:

And have you never seen a steam train? These locomotives, these `"external combustion engines"`, were extraordinarily powerful, and they were driven by the phase transition vapour to liquid......

And of course, given a constant pressure, we may heat the steam to a very high temperature,