Question

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

Answer 1

depends on gravity...partially
usually in vaccum no difference as weight is the gravity experienced by a body due to its mass but air will also exert atmo. pressure so more in air

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Answer 2

the weight will be more in vaccum.
Because, the air applies pressure evenly on the body, i.e. it also applies force upwards too; but in vaccum there's no such resisting force.
Therefore, the body will weigh more in vaccum