Why there is a loss in the weight of body when emerged in a fluid?
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The weight of an object is defined by its mass, times the acceleration due to gravity. i.e, w=mg, thus weight is a measure of the force of gravity acting on an object's mass.
A ball, or any object for that matter, weighs the same in air as well as in water. But in water (due to its density of 1000 kg/m³), an additional buoyant force acts on the ball in a direction opposite to the direction in which the weight of the ball acts. Thus, if the weight of the ball acts downwards, buoyant force acts upwards. These two forces work together to make it seem as thought the ball weighs less in water.
The same principle also acts on the ball while it is in air, but due to its very low density, the buoyant force acting on the ball is almost negligible.
Archimedes' principal states that, the magnitude of the upward force an object immersed in a fluid experiences is equal to the weight of the fluid displaced due to that object.
weight = mass * acceleration due to gravity
mass = density * volume
weight = density * volume* acceleration due to gravity
low density means low weight, volume and acceleration due to gravity being constant.
So, the weight of air displaced by the ball is very less because of its low density, and hence the displaced air exerts negligible buoyant force.
A ball, or any object for that matter, weighs the same in air as well as in water. But in water (due to its density of 1000 kg/m³), an additional buoyant force acts on the ball in a direction opposite to the direction in which the weight of the ball acts. Thus, if the weight of the ball acts downwards, buoyant force acts upwards. These two forces work together to make it seem as thought the ball weighs less in water.
The same principle also acts on the ball while it is in air, but due to its very low density, the buoyant force acting on the ball is almost negligible.
Archimedes' principal states that, the magnitude of the upward force an object immersed in a fluid experiences is equal to the weight of the fluid displaced due to that object.
weight = mass * acceleration due to gravity
mass = density * volume
weight = density * volume* acceleration due to gravity
low density means low weight, volume and acceleration due to gravity being constant.
So, the weight of air displaced by the ball is very less because of its low density, and hence the displaced air exerts negligible buoyant force.
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