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

In this activity, learners explore the invisible infrared radiation from an electric heater.

In this activity, learners make their own heat waves in an aquarium.

Using two baby food jars, food coloring, and an index card, you'll 'marry' the jars to see how hot water and cold water mix.

In this demonstration, cook a cake using the heat produced when the cake batter conducts an electric current.

In this activity, learners discover that our hands are not reliable thermometers.

In this activity, learners explore liquid crystals, light and temperature. Using a postcard made of temperature-sensitive liquid crystal material, learners monitor temperature changes.

This Exploratorium activity can be used in many contexts because geysers are great opportunities for learning about heat and temperature changes as well as geological/space science phenomena.