MAKE A THERMOMETER

YOU NEED:

• 1 clear plastic straw
• 1 empty juice bottle
• 1 cup
• food color
• clay
• water

DO THIS:

1. Fill the bottle half full with room temperature water.

2. Add a few drops of food color and mix.

3. Put the straw in the bottle. Wrap the clay around it to hold it in place; do not push the straw through the clay. Also, it is important that the clay completely seals the bottle around the straw.

4. Fill the cup half way with cold tap water. Put your thermometer in the cup. What happens?

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5. Now fill the cup half way with hot tap water. Put your thermometer in the cup. What happens?

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QUESTION:

Why does the water in the straw rise and fall with different

temperatures? (Hint: remember the hot and cold balloons?)

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