The vapors coming out of Viet's forehead smell nice for some reason.
That's still steaming hot, so be careful.
To make good sushi rice, you need to mix vinegar into steaming hot, freshly cooked rice, using a paddle. Believe it or not, it actually takes skill to mix the vinegar into the rice without crushing the individual grains.
Hot water's energy isn't the hot water itself, it's what comes out of it (when it's boiling, for example). This is the steam and vapor.
The ゆ part of the reading makes sense. The げ part for 気 is a bit of an exception. Just think of yourself standing in the steams and vapors. You're getting all hot and sweaty, but the feeling makes you incredibly happy and gay (げ). Then someone asks, as they look at you in the steam: "Hey, you gay?" (ゆげ). You answer however you want to answer.