The stove heats the pan. The pan heats the water.

A thermometer stands in the water. The red liquid climbs.

The kitchen thermometer in the pan reads 212 °F. On the Celsius side, that is 100 °C.

When the thermometer reads 212 °F, bubbles form all through the water.

The bubbles rise to the top and burst. The water is boiling.

The water boils: bubbles form all through it and rise to the top. A white cloud hangs above the pan.

Inside each bubble is water vapor. The hot water is turning into water vapor, fast.

The water vapor goes off into the air of the kitchen.