Different Gases
by Anonymous · ⭐ 1 · 🍴 0
In Air Has Weight, weigh an empty PET bottle against one pumped full of air — the number on the scale proves that invisible air really does weigh something. In Bigger, Smaller, heat a balloon and watch it swell, press it and watch it shrink, then move the scene deep underwater or up a mountain to see pressure change its volume too. In Which Gas Is It?, run tests on oxygen, carbon dioxide, nitrogen, and helium one by one to tell them apart and learn what each is used for. Invisible doesn't mean nonexistent — weight and volume make air's behavior visible.
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