She'd have to do something quickly or the very last water would boil away.

"The water was boiling when I took it off the fire a moment before."

A voice from the kitchen would call us when the water was boiling.

Does this mean the water is actually boiling on the inside, or could it be something else?

If you lower the pressure enough, water will boil at room temperature.

By that time the water was boiling in the pot.

In fact, when you do this, the water will boil and freeze at the same time.

These show the water boiling as the flow passed over it.

This makes the water boil even though there is no heat applied.

While the water boiled, he tended to his arm again.