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# Science Project on “Convection and Temperature”, Project Experiment Topics on Environmental Science for Class 8, 9, 10 and 12 Students.

Convection and Temperature

Materials Required:

1. Two clear drinking glasses
2. Water
3. Bottle of red food colouring
4. Bottle of blue food colouring
5. A refrigerator

When a body of air becomes warmer than the air around it, that body of air rises. It rises because it is lighter and less dense than the other. Warm air rises and cold air falls. When air flows this way, it’s called Convection. On a hot summer day, you can see warm air rising from a blacktop road or from a barbeque grill.

Convection happens in case of water too. When you go swimming, you will notice that when you are standing, the water by your feet is colder than the water that reaches your chest. During the daytime, the surface water gets warmed because of the sun and is the first to cool off at night. As it does the water drops down. The warm water underneath is then pushed upwards, as the cold water is heavier and more dense.

To prove this hypothesis is true, pour water into a clear drinking glass. Put the glass of water in the refrigerator. Also put a bottle of blue food coloring in the refrigerator. Wait for one hour and then take them out of the refrigerator. Fill the other clear drinking glass with hot water, from a sink faucet. Do not make it too hot as you don’t want to burn yourself. With the bottle of red food colouring at room temperature, slowly squeeze six drops into the glass of cold water. As the cold water is denser, the red colouring stays on top. Slowly squeeze six drops of red food colouring into the glass of hot water. What happens?

Stir both glasses. Then, squeeze six drops of the cold, blue food colouring into the glass of cold water. What happens? Squeeze drops of the blue food colouring into the glass of hot water. Does the blue colouring sink? Instead of using food colouring in the two glasses of water, can you make use of natural food colouring? Try juice from a can of red beets, a weak tea or some cranberry juice.

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