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Mechanical Properties of Fluids — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsMechanical Properties of Fluids1 Mark
Question
Why does a soft plastic bag weigh the same when empty as when filled with air at atmospheric pressure?
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Answer

Actually the weight of plastic bag when filled with air pressure is more than when it is empty. The increase in weight equals the buoyant force due to air, so the bag weighs the same.

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