If you run water, then put 2 spoons together under the water.. Why does this happen?
494151
It's bernoulli's principle. Fluids have a lower pressure when moving than when still. Since the water is moving past the spoons (which act like the wing of a plane) they feel a pull from the pressure drop and come together. Try it with a peice of paper sometime. Roll a piec of paper up so when you place it on a flat surface it looks like a curved bridge. then blow under it and it will collapse instead of blow away. It's pretty neet.
485222
I think its bcoz of some lyophobic particles present... im not sure..... jus guessin...
976344
The salt gets dissolved in the water.
303722
Most of the time it's accidental.  They are scooping up food that are close to the shore...low and beyhold the water is too shallow and they find themselves ashore.
409824
When what is mixed is not fully disolved into the liquid medium.  It usually settles.  A cenrifuge will not separate out the components that are not part of the solution.
967696
because the blood supply that would normally be used to help digest the food is diverted to your muscles for swimming. So the food doesn't digest properly and you get indigestion.
460879
What your actually thinking of are baffles. These cause the water to travel in a zig zag way or even perpendicular to flow direction. This slows the water by taking its Kinetic Energy and so reduces wear on other structures or machinery
967355
try thinking about the energy needed to break the ionic bonds. water can be split, but the energy needed is massive, because the bonds are so stable
161441
As the water starts to circle, it is thrown to the outside, due to centrifugal force (to be more accurate, the force that it experiences is centripetal force=(mv^2)/r since centrifugal force is a so-called fictitious force). As it's thrown outside, it starts to move faster (when things move in a circle, the things that are nearer the outside move faster than things near the center; you can see this if you have a "old-fashioned" record player by putting two coins on it, one near the center and one near the outer edge and trace how long it takes them to complete the lengths of their paths). So the circling water near the outer rim is moving very fast and experiences bigger forces (since the force is proportional to velocity). But the water near the middle is moving slower because it's being dragged along the bottom and so ends up slowing down much more. Since the water near the bottom is moving so slowly, it exhibits a much lower centrifugal force and so there is little to no centrifugal force near the bottom (or middle). This is why you have a whirlpool (vortex): the water near the top is pushed out more (since there's higher centrifugal force there) and the water near the bottom is hardly pushed outward at all (since there's lower centrifugal force near the bottom to push it out).
976394
Seems to me like an accumulation of thousands of (young) fish, encountering plancton(food).\nOtherwise, it could have been the rising/falling tide, causing a whirlpool-like motion in the waters, which occur only once at that very same spot during the rise or fall of the tide, because of the constant changing water level. At falling tide, for example, if the water has to pass through a formation of rocks that are still submerged and invisible, the waters on the surface start to move noticeably, and if the trapped water body is large, it may create a scary scenario, which is indeed seriously dangerous for any swimmers caught in it.
648278
a tab floats and stops the water
368269
i noticed that too!!!! like by the hundreds, i think either the water drifts them out, or they can't breath under the water and the mud so they get out!
194730
I think it has something to do with the fact that the fish are not grounded to the earth so the current just travels around them not through them.
204493
Well, I look at it like this.  It is half full because you put water into it.  If it was completely full, then you drank some of the water, it would half empty because you took away the water.
46530
it's the same reason that if you mix oil and water in a glass, the oil will float to the top and the water will sink to the bottom.  oil has a lower density, which makes it lighter.  the heavier water gets pulled down by gravity and it displaces the oil.  since it is a liquid, the molecules of oil and water can move relative to each other.\n\nthe inside of the earth is a liquid, too - it is very hot and all but the outer surface of the earth is molten rock.  this has over time allowed the lighter minerals like quartz and feldspar to rise to the surface, while the heavier minerals like nickel and iron make up the earth's core.
315092
Water and impurities in the water cause friction.
461903
It happens in the atmosphere too, but to a lesser degree.\n\nWater (even pure water) reflects, refracts, and absorbs light.  As light passes through a body of water, some of the light is reflected back, some of the light is refracted (bent), and some of the light is absorbed (leading to warming of the water).  The more water the light has to pass through, the more of the light that is reflected, refracted, or absorbed.  So the deeper you go, the less light will reach you.\n\nTo simplify, just consider absorbsion.  If a cloumn of water one metre deep absorbs 50% of the light that passes through it, then the light at the top of the column will be 100% and at the bottom only 50%.  Add another column of one metre under the first column and it will absorb 50% of the light that passes through it.  It has 50% of the total light available at the top, so only 25% remains at the bottom.\nAnd so on.