Sugar melts in hot water.
You have tennis elbow. Soak your arm in warm water.
Japanese love to soak in a hot tub before bed.
She observed how butterflies fly.
The geyser sends up a column of hot water every two hours.
Run hot water into the bath.
Put the eggs into the boiling water.
The water is boiling away.
Ah, this hot water's good!
Put some salt into the boiling water.