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Yes, a balloon shows that air can be compressed. The pressure in the balloon is higher than the pressure outside the balloon. The ideal gas law is

PV = nRT

where:

P = pressure

V = volume

n = the number of moles of gas (the amount of gas)

R = the ideal gas constant

T = temperature

So for the given volume of the balloon, and at a set temperature, if the pressure goes up, the amount of gas (the number of moles) must also go up. That means that the gas has been compressed.

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10y ago

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