Why does a body immeresed in water weight less than it weight in air ?
Answer:
the water has more density than compared to air.
any body immersed in water experiences an upward thrust which makes its weight lesser.
the falling body due to its weight pushes water down wards(displaces water as much as its weight-archemedes principle)water being dense cannot escape.it provides an upward thrust instead as if pushing the body upward.
if the body is less dense than water,it will float.or else it will sink
because water is more dense than air, so the water would push up on you more, so it would be like you weigh less.
Wrong, whether immersed in water or in air the body weighs the same. A body will float in water if it weighs less than the volume of water it displaces. A cruise liner of 80000 tonnes still weighs 80000 tonnes whether it is floating or in dry dock.
Its true.
Air is less dense than water.
"Every body immersed in a fluid experiences a thrust called the BUOYANCY FORCE and the buoyancy force exerted by a fluid onto a solid is proportional to the specific gravity of the fluid"--- ARCHIMEDES PRINCIPLE.
So, air being less denser than water, exerts a lesser buoyancy force than water. so the resultant force acting on the body is high in air and that is the weight od the body.
Hence a body weighs less in water than in air.
All bodies put in air or liquid (such as watter) is acted by buoyancy force.
This force is equal to total pressure acted on outside surface of body. It is ratio with density of material around (such as air or liquid) and this body's volume. This force have inverted direction with gravity force.
Because water's density is higher than air density, the buoyancy force caused by watter is higher than the one in air, so the total weight (= weight - buoyancy force) in watter is smaller
From Archimedes principle that states that,
"when a body is partially immersed in a fluid medium, it receives an upthrust which is equal to the weight of the volume of the fluid displaced".
what this means is that when the body is totally immersed in water or air, it displaces some fluid of its own volume and the weight of the displaced fluid is the product if its volume and its density.
As it so happens, water has a larger density (1000kg/m3) than air (1.2kg/m3). For this reason, for the same amount of fluid displaced by the body, the weight of water displaced will be grater than that of air displaced which means a body suffers greater upthrust in water than in air which explains why a body imersed in water weighs more than in air.
upthrust- upward force acting on a body
fluid- term used to mean both liquids and gases
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