Heres a hot invention that makes for very cool science.
Fill a bottle to the top with warm water. Add a few drops of food coloring to the water. Stick some clay around a straw. Put 1/3 of the straw in the bottle. Use the clay to seal the bottle closed and hold the straw in place. (Make sure the bottle is completely sealed.) How much water is in the straw? Mark the water level on the straw. Put the bottle in a bowl of ice. What happens? (It may take a few minutes before you notice any changes.)
How does your thermometer compare to the one you used to measure the melting point of chocolate?
What improvements could you make to yours?
Change one thing, like use a different size bottle or a glass bottle. Then predict what you think will happen and test it.
your reports to:
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