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Condensation

Condensation is what happens when warm, moist air cools down and turns into tiny water drops.

Think of it this way

Hold a cold glass of water on a warm day. The outside of the glass gets wet — not from a leak, but from air touching the cold surface. Water vapor in the warm air hits the cold glass and turns into tiny drops. Those drops bead up and run down the side of the glass.

Explaining condensation by grade level

When you make fog in a bottle, warm wet air meets something cold. The air cools down fast. The water that was hiding in the air shows up as tiny drops you can see. That fog is water that came out of the air.

Projects that explore condensation

Fog Formation in a Bottle

Fog is just a cloud that sits near the ground — and this experiment lets you make one inside a bottle. When warm, moist air meets something cold, it condenses into tiny water drops. You fill a bottle halfway with very hot water, pour out most of it, then place an ice cube in the mouth. As the moist air inside cools quickly, a small fog cloud forms. The cold bottle, filled with cold water from the start, stays clear because there is no warm, moist air to cool down.

Easy