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In this activity, learners observe a quick phase change as water rapidly goes from a liquid state to a solid state.

$1 - $5 per student Ages 6 - 14 10 to 30 minutes
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Experiment with liquids of different densities and create liquid layers. For example, oil and water have different densities: oil floats on water because it is less dense than water.

1 cent - $1 per student Ages 4 - 8 10 to 30 minutes
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In this activity about magnetism (page 13 of the pdf), learners will experiment with magnets to explore how water and other liquids affect the strength of magnetic fields.

$1 - $5 per group Ages 6 - 11 10 to 30 minutes
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Making liquids of different densities to perfectly lay on top of each other can be a frustrating exercise. The Exploratorium created this activity as a fool proof way of making a density column.

1 cent - $1 per student Ages 6 - 18 5 to 10 minutes
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In this playful, goopy activity, learners mix two liquids to create a solid (that sometimes acts like a liquid ), using basic household materials such as borax and glue.

$1 - $5 per student Ages 6 - 11 45 to 60 minutes
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"Sublimation Bubbles" allows learners to explore how some solid materials, such as dry ice, can phase change directly from their solid to gaseous form.

Over $20 per group Ages 6 - adult 5 to 10 minutes
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This activity (on page 2 of the PDF) features a recipe to create the stretchy polymer Flubber from Borax detergent, white glue, and water.

$1 - $5 per student Ages 4 - 14 10 to 30 minutes
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Make a quick and easy filter from household materials. A filter will catch any solids suspended in a liquid and filter them out. By using a filter, learners can discover amazing things.

1 cent - $1 per student Ages 4 - 8 5 to 10 minutes