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Can You Make Ice Cream in Two Minutes?
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In this demonstration, learners observe how liquid nitrogen both boils and freezes ingredients to make ice cream in two minutes.
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Supercooled Water Drops
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In this activity, learners touch supercooled water drops with an ice crystal and trigger the water drops to freeze instantly.
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Frozen Fruit
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In this "Sid the Science Kid" activity from Episode 108: My Ice Pops, learners observe reversible change while thinking about ways to make ice melt.
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Light Soda
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In this activity, learners sublimate dry ice and then taste the carbon dioxide gas.
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Sugar/Salt Crystals
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In this chemistry activity (page 1 of the PDF), learners will observe a physical change.
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Hot Stuff!
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In this activity, learners discover that sand is the major ingredient in glass.