Materials:
-Bottle (50cl.), water, alcohol (96º), food coloring, straw and putty (play-doh).
Instructions:
-Combine the alcohol with water (same quantity, 1/1) and food coloring. Mix it.
-Make a hole in the bottle’s cap.
-Put the straw trough the hole.
-Seal the hole with putty.
-Leave it in a sunny place.
Why does it work?
It works because when an object gets hot, usually gets bigger.
