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Heat makes some materials expand, and it makes others shrink.

In this hands-on activity, learners use heat to shrink samples of polystyrene plastic (#6 recycle code). Learners compare the size and shape of the plastic pieces before and after shrinking.

In this hands-on activity (on page 2 of the PDF), learners experiment with lemon juice and paper to create a message that can only be revealed using chemistry.

In this activity, learners use chocolate to explore how the Sun transfers heat to the Earth through radiation.

This activity about density provides instructions for making a miniature "lava lite" with just salt, oil, water, and food coloring.

Conduct a simple experiment to explore how temperature changes can make things expand or contract.

In this activity, learners explore why humans sweat. Learners compare the effects of heat on a balloon filled with air and a balloon filled water.