This fun-filled experiment will enable you to make smoke rings in water. Amazed! Well, why don’t you give it a try?
Things Required:
1 large-mouthed, clear, glass, quart jar
Red food colouring
Small baby food jar
6-inch square of aluminium foil
Rubber band
Pencil
1 ice cube
Directions:
Place the ice cube in the baby food jar. Fill the jar with cold water. Fill the quart jar to within an inch of the top with hot water from the faucet. Remove the ice cube from the baby food jar. Add and stir in six to seven drops of food colouring. Cover the mouth of the baby food jar with aluminium foil. Use the rubber band to secure the foil around the mouth of the jar. Use the point of the pencil to make a small hole in the aluminium foil. Quickly turn the baby food jar upside down and hold it so that the hole may be just beneath the surface of the hot water. Slowly and gently, tap the bottom of the baby food jar with the eraser of the pencil or your finger.
This Is What Happens:
The cold coloured water flows downward. The tapping causes the coloured water to come out in spurts, producing smoke-like rings of colour in the warm clear water.
Science Behind It:
Cold water weighs more than warm water because the cold water molecules are closer together. The molecules of water, like oil matter, are spaced closer together when cold, and farther apart when heated. The food colouring has little or no effect on the weight. Since the cold water is heavier, it sinks down through the lighter warmer water.
