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?
Sometimes we see leaves and grass sparkle with water-drops, early in the morning, When the sun shines out and warms the air; what happens?
Why does vapor rise into the air?
Why does smoke go up? Because it is lighter than air. As vapor is lighter than air; what do you think ought to happen to it?
LESSON XV.
HOW VAPOR IS CHANGED TO WATER,
Heat, as you have learned, changes water into vapor. You must also know that cold turns vapor back into water again.