What is the water changed into?

It is changed to vapor. If we let the kettle remain on the fire long
enough, the water it contains will all pass away as vapor.

Where does the vapor go? The water, though turned into vapor, must be
somewhere.

It is floating about in the air of the room, though we cannot see it.
The air holds the vapor, just as a sponge holds water.

Heat expands or swells air. Warm air, therefore, can contain more vapor
than cold air. On a warm day there may be many times as much moisture in
the air as on a cold day.

Moisten your slate with a damp sponge. Observe the disappearance of the
moisture.

Dip your hand in water, and wave it in the air. The water on your hand
disappears. Where has it gone?

When wet clothes are hung on the line, they soon become dry. What
becomes of the water in the clothes?

If we set a plate of water out in the sunshine, what happens? Is the
water lost?

The streets and roads were wet and muddy, now they are dry. What has
become of the water? Has it all sunk into the ground?