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Classroom mode

Run it in class

How does the AC make cold air?

Show of hands — before you project anything

Predict before we test: if you squeeze a gas, does it get hotter or colder — and what about letting it expand?

  • A Way more than you'd guess
  • B About what you'd guess
  • C Way less than you'd guess

Count the votes out loud. Hold them to it — then watch.

Project it (fullscreen)

Discussion prompts

  • Predict before we test: if you squeeze a gas, does it get hotter or colder — and what about letting it expand?
  • Predict: on a freezing 0° day, could a machine still find heat outside to pull into the house?
  • Predict: is it cheaper to MAKE heat from scratch, or to CARRY heat that's already there?

Where it shows up in real life

  • The warm air blowing off the outdoor AC box or from behind the refrigerator
  • A car's air conditioner and the little puddle of water it drips under a parked car in summer
  • Heat-pump water heaters and home heat pumps that both cool in summer and warm in winter

A prediction-first worksheet — no answer key.

zero prep · no login · any projector

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