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# The weight of the body is maximum inA. AirB. HydrogenC. WaterD. Vacuum

Last updated date: 18th Sep 2024
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Hint: When a body is placed in a medium, two forces are acting on it namely Gravitational force and Buoyant force, both of these forces act in opposite directions so the net weight of the body is the difference of these forces.

The buoyant force is the upward force acting on a body by a liquid or gas when the body is immersed in the liquid or gas partly or completely.
Now, according to Archimedes’ principle, when a body is immersed in a liquid or gas partly or completely, there is some loss in the weight of the body and the loss in weight is equal to the weight of liquid or gas displaced by the immersed part of the body.
So when a body is placed in a medium its resultant weight = Gravitational force – Buoyant force.
So for the maximum value of the weight, the buoyant force has to be minimum.
There is no buoyant force in a vacuum so the weight of the body is maximum in the vacuum.

So, the correct answer is “Option D”.

$W = mg$ where $W =$ weight of the body, $m =$ mass of the body and $g =$ gravitational acceleration. (Gravitational acceleration is the free-fall acceleration of a body in the vacuum)