Take an empty plastic bottle (of course with air inside). You know that the number of atoms outside is a lot more than the number of atoms inside the bottle. Why then doesn’t it get crushed?The atoms inside the bottle are faster than the outside atoms.The air inside is denser than the air outside.Air inside is hotter and so the pressure is more inside.Though the number of atoms inside is less, the density of air inside is the same.
Question
Take an empty plastic bottle (of course with air inside). You know that the number of atoms outside is a lot more than the number of atoms inside the bottle. Why then doesn’t it get crushed?The atoms inside the bottle are faster than the outside atoms.The air inside is denser than the air outside.Air inside is hotter and so the pressure is more inside.Though the number of atoms inside is less, the density of air inside is the same.
Solution
The reason why an empty plastic bottle doesn't get crushed, despite having fewer atoms inside than outside, is due to the principle of air pressure.
Air pressure is the force exerted by air molecules colliding with surfaces. It is not about the number of molecules, but the force they exert. Inside the bottle, the air molecules are moving in all directions and colliding with the bottle's interior, exerting pressure.
Even though there are fewer molecules inside the bottle, the pressure they exert is enough to balance the pressure exerted by the air molecules outside the bottle. Therefore, the bottle doesn't get crushed.
The speed, density, or temperature of the air inside the bottle doesn't necessarily have to be different from the air outside for this balance to occur. As long as the pressure inside the bottle is equal to the atmospheric pressure outside, the bottle will maintain its shape.
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