Recipe writers hate to write about heat. They despise it. Because there aren't proper words for communicating what should be done with it.
Alton BrownA meringue is really nothing but a foam. And what is a foam after all, but a big collection of bubbles? And what's a bubble? It's basically a very flimsy little latticework of proteins draped with water. We add sugar to this structure, which strengthens it. But things can, and do, go wrong.
Alton Brown