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Learners add two dyes to mineral oil and water, and then compare their miscibility (how well they mix) in each.

$1 - $5 per group Ages 8 - 18 5 to 10 minutes
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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