Grades 1 - 4
Expanding Ice Trick: As water turns to ice, it expands as much as nine percent. This is why, when the temperature drops below 0ºC, “frost wedging” can occur. Water trapped in tiny cracks expands, causing sidewalks to split and potholes to form. Show your students frost wedging in action with this experiment. Fill a plastic soda bottle to the brim, and screw the cap on tight. Place the bottle in a freezer overnight, and the next day you’ll find that the bottle has split open. The ice has expanded outside the bottle!