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Yes, you can weigh your car by figuring out your wheel's tire pressure combined with the "tire's footprint." You'll need someone with a car, driver's license, and safety in mind.

free Ages 11 - adult 10 to 30 minutes
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Learners measure a bottle full of air, and then use a vacuum pump to remove the air. When they re-weigh the bottle, learners find the mass is about 0.8g less.

Over $20 per student Ages 11 - adult 5 to 10 minutes
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In this activity, learners will make their own prism and use a glass of water to separate sunlight into different colors.

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