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In this activity, learners explore how ordinary marshmallows expand when heated in a microwave.

In this chemistry challenge, learners discover that many chemical reactions involve heat loss or gain.

In this quick and easy activity and/or demonstration, learners use two empty 2-liter bottles and hot tap water to illustrate the effect of heat on pressure.

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

In this activity, learners explore atoms as the smallest building blocks of matter. With adult help, learners start by dividing play dough in half, over and over again.

In this activity, challenge learners to keep an ice cube from completely melting in 30 minutes. Learners engineer a box or wrap to prevent an ice cube from melting.

In two separate bags, learners mix water with Epsom salts and detergent.

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.

In this activity on page 2 of the PDF, learners test different materials to find out which is the best insulator.

In this activity, learners create a biosphere in a baggie.

Learners design their own experiment to compare how well cocoa mix dissolves in cold and hot water. They will see that cocoa mix dissolves much better in hot water. Adult supervision recommended.

In this physics activity (page 2 of the PDF), learners will explore the concept of thermal conductivity and learn the differences between high and low thermal conductivity.