Q10 of 11 Page 268

Will a body weigh more in air or in vacuum when weighed with a spring balance? Give a reason for your answer

Vacuum is the area devoid of matter and air contains many tiny particles and gases.

When a body is weighed by a spring balance the body will weigh more in a vacuum than in the air. This happens because of the upward buoyant force that the particles in air provide to the body that reduces the weight of the body.


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A piece of iron of density 7.8 × 103 kgm–3 and volume 100 cm3 is totally immersed in water. Calculate

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(b) The up thrust


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