why objects lose weight in water?

Question

I feel the metal bucket is less weight in water than in the air , why? Will the object's weight will differ in Oil when compared to water?

Answer 1

The simple answer is, buoyancy. But, this would lead you to ask what causes buoyancy.

Buoyancy in water is caused by the pressure change an object feels between its top and bottom when immersed in water. Imagine a cylinder immersed in water, its axis aligned with the y-axis. Its top area will feel less force ( F = P*A ) than its bottom area, and hence an upward push.

If you work through the math of the simple model above, you'll derive Archimedes's principal quite easily. (That is, the buoyant force is equal to the weight of water the object displaces.)

Answer 2

perhaps, you know that water (as well as all liquids and gases) always applies equal pressure in all directions, and the value depends only on the depth, and density.
When you put an object into water, there is more pressure applied to its bottom, then to its top, because the bottom is deeper. This difference results in upward force, that counters gravitiy. The larger (wider and taller) is the object, the bigger is the force (the difference in pressure grows higher when the object is taller, and the pressure is applied to a large surface - thus bigger force - when it is wider).
If the object is light enough (like wood or plastic), then this force is even bigger than the gravity - and the object then floats. With heavier materials - metals, rocks etc. - the upward force is smaller than gravity (because gravity depends on mass - the bigger the mass, the higher the gravity - and the archemede's force only depends on volume - that's why dense objects sink, and light object s float), so the metal bucket will still sink, but it will become lighter, since some of its weight is compensated by the archemede's force.
Now, like I said in the beginning the value of pressure that liquid applies depends on its density. The higher the density, the more the pressure.
Water is denser than air - that's why heavy objecs become lighter or even float.
Oil is even denser then water - so, object in oil will lose even more weight, and some things that sink in water will float in oil.

Answer 3

Buoyant force. Water has a density of one (g/cc). A metal bucket with a density of seven will have an apparent weight of 6/7 of it's true weight in water and slightly more in oil, which has a density of about 0.9.

Answer 4

its very true. Discovered by Archimedes, the weight of any object is much lighter in water. This is because part of the weight of the water is sustained by the water, therefore making the object lighter. This will definately differ in oil since the oil's molecule structure is knitted much closer, i.e the molecules are not very far apart as in water and this is the reason of the difference

Answer 5

its something called upthrust. acording to archimedes' principle, when an object wholly or patially immerses itself in a fluid, the amount of the fluid dsplaced is equal to the weight of the object.
basically that means that when you are in water you feel lighter beacause you are able to dsplace your own weight in the water. this is also why boats made of metal dont sink.

Answer 6

Consume low calorie food

Answer 7

take a break from chicken with tofu

Answer 8

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Answer 9

Try yoga to lose weight

Answer 10

actually, i doubt that metal bucket feels lighter in water (unless it's empty... once you fill it it would weigh the same while completely submerged). however, people only weigh 60% of their normal weight when they are submerged. This is NOT because you actually lose weight in the water, but because there are bouyant actions which counter the action of gravity in causing weight. anything that has bouyancy in water will seem to weigh less when submerged.

with other substances (such as oil) it would depend on their characteristics. i believe most if not all oils are less dense than water, which means the bouyancy effects would likely be reduced, meaning you would weigh less in oil than you would in air, but you would weigh MORE in oil than you would in water. then again, it depends on more than just the liquid we're talking about, but also the characteristics of the object you're submerging as well.