Can body float in water at different depth level..?
Can we make one body to float at different depth level on water..? Please post that how is it possible?😒
Replies
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Ramani AswathConsider a body of water that has a uniform temperature gradient higher at the surface and progressively colder downward. There will be a corresponding density gradient. Any object with a density in between that at the top and at the bottom will float at a point where the density matches.
Alternatively, in a static body of water and in the absence of thermal currents, a body of matching density can remain stationary anywhere, though even the slightest disturbance will cause it to move. -
zaveriA submarine remains submerged in water at a particular depth by controlling the water content in its ballast tanks. does that principle apply here ?
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Ramani Aswath
To some extent, yes.zaveriA submarine remains submerged in water at a particular depth by controlling the water content in its ballast tanks. does that principle apply here ?
Submarine is an active device. The propeller can keep it at any depth. This is not applicable to passive objects. -
sureshkumargcebioramaniConsider a body of water that has a uniform temperature gradient higher at the surface and progressively colder downward. There will be a corresponding density gradient. Any object with a density in between that at the top and at the bottom will float at a point where the density matches.
Alternatively, in a static body of water and in the absence of thermal currents, a body of matching density can remain stationary anywhere, though even the slightest disturbance will cause it to move.
In the static body of water (absence of thermal currents)the body has to float at different regions.Is it possible by fixing any small propeller.? What type of calculations have to be made.? -
Ramani Aswath
Size of the propeller will depend on the inertia of the system. The object may float at a given point. However, though it has zero weight its inertia depends on its mass plus drag in the medium. The larger the size, the greater this effect unless streamlined.sureshkumargceIn the static body of water (absence of thermal currents)the body has to float at different regions.Is it possible by fixing any small propeller.? What type of calculations have to be made.? -
Mohit Kamat
Sir i'm new to engineering so could you please explain in simpler words, as i don't know what exactly is temperature gradient or thermal currents either. If you could explain your answer with an example??? thanks 😀bioramaniConsider a body of water that has a uniform temperature gradient higher at the surface and progressively colder downward. There will be a corresponding density gradient. Any object with a density in between that at the top and at the bottom will float at a point where the density matches.
Alternatively, in a static body of water and in the absence of thermal currents, a body of matching density can remain stationary anywhere, though even the slightest disturbance will cause it to move. -
Ramani AswathLet us assume that the top surface of the water is at 60 C. The density is 0.9832 gm/cc.
Let us assume that the bottom of the water is at 20 C. The density is 0.9982 gm/cc.
If your object has a density 0.99 gm/cc it will sink to some where near the middle of the water depth where the temperature will be a bit below 40 C.
Here is a video that demonstrates thermal currents:
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Mohit Kamatthanks sir...appreciate your effort 😀
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ABCD ABCDi had heard of a magic trick, in which an egg neither floats nor sink in water. It uses the same principle. Usually a boiled egg submerges completely and a unboiled egg floats on water.
BTW, is the mass of boiled egg more than unboiled one? -
Ramani AswathNot quite. If an unboiled egg floats it is spoilt.
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ABCD ABCD
oh ok... haven't experimented it, but read it somewhere.bioramaniNot quite. If an unboiled egg floats it is spoilt. -
Ramani Aswath
The shell is impervious to water. Except for a very small bubble at the top eggs are usually already full. Other than snakes' eggs, which are leathery, birds' eggs are rigid. It is unlikely that boiling leads to an increase in density.mreccentricBTW, is the mass of boiled egg more than unboiled one? -
ABCD ABCD
TY... Then what do you think makes it float or sink? i know that, i can verify this as i have that book... but what makes the boiled egg semi-solidify when boiled?, as you say its impermeable.bioramaniThe shell is impervious to water. Except for a very small bubble at the top eggs are usually already full. Other than snakes' eggs, which are leathery, birds' eggs are rigid. It is unlikely that boiling leads to an increase in density. -
Ramani Aswath
That is a simple matter. The yellow yolk becomes a solid powder on cooking. The white is essentially albumin that gels into a semi solid on cooking.mreccentricbut what makes the boiled egg semi-solidify when boiled?, as you say its impermeable. -
ABCD ABCD
does that also mean that there is some chemical change?bioramaniThat is a simple matter. The yellow yolk becomes a solid powder on cooking. The white is essentially albumin that gels into a semi solid on cooking. -
Ramani Aswath
You are right. Boiling is a chemical change. A boiled egg does not become a raw one, no more than a boiled chicken lay eggs.mreccentricdoes that also mean that there is some chemical change? -
ABCD ABCDlol... that answers...
for those who followed my posts, infact, both boiled and unboiled egg sink in water. whereas, a rotten egg floats. Please dont ask my why, as i dont know. -
jishnu nairbioramaniConsider a body of water that has a uniform temperature gradient higher at the surface and progressively colder downward. There will be a corresponding density gradient. Any object with a density in between that at the top and at the bottom will float at a point where the density matches.
Alternatively, in a static body of water and in the absence of thermal currents, a body of matching density can remain stationary anywhere, though even the slightest disturbance will cause it to move. -
jishnu nairbioramaniConsider a body of water that has a uniform temperature gradient higher at the surface and progressively colder downward. There will be a corresponding density gradient. Any object with a density in between that at the top and at the bottom will float at a point where the density matches.
Alternatively, in a static body of water and in the absence of thermal currents, a body of matching density can remain stationary anywhere, though even the slightest disturbance will cause it to move. -
CE DesignerThis concept is used to design level sensors for industry.
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