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Phase Changes

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Learners observe a sealed test tube containing a small amount of solid stearic acid.
$5 - $10 per group Ages 11 - 18 5 to 10 minutes

Balloon in a Flask

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Learners observe a flask with a balloon attached over the mouth and inverted inside the flask.
$1 - $5 per group Ages 11 - adult 30 to 45 minutes