Question

A box, when hung from a spring balance shows a reading of 50 kg. If the same box is hung from
the same spring balance inside an evacuated chamber, the reading on the scale will be
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Answer 1

If the same box is hung form the spring balance inside an evacuated chamber, the reading on the scale will be more than 50kg because the atmospheric buoyancy force will be absent. As in evacuated chamber in absence of air the air buoyancy is absent and hence shows reading more than the reading in air

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Answer 2

A box, when hung from a spring balance shows a reading of 50 kg. If the same box is hung form the spring balance inside an evacuated chamber, the reading on the scale will be more than 50kg because the atmospheric buoyancy force will be absent. As in evacuated chamber in absence of air the air buoyancy is absent and hence shows reading more than the reading in air.