Air and the atmosphere are invisible. That makes it a little tricky to think of it as having properties like mass, volume, and pressure. Below are two activities from
ThoughtCo. that should help you prove that air, indeed, has properties. (Click the picture below to visit the website.)
Activity 1 Underwater Air Bubbles: As you allow an air bubble to escape, what happens? Why does this happen?
Activity Air Balloons: As you progress through this activity, ask yourself the following question: What would happen if you try to inflate the balloon inside of the bottle?
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