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There is NO property of water that allows things to float. Floating in not a property of a substance. It is the difference in density of two objects that allows one to be buoyant when surrounded by the other. This a balloon can float on air, A steel ship can float on water and oil can float on water.
A needle sink in water.
when water turns to ice its volume increases whilst its weight stays the same, therefore ice has a lower density than water, and this allows it to float.
the way it float is surface tension!!
Water surface tension hold the needle on the water surface.
There is NO property of water that allows things to float. Floating in not a property of a substance. It is the difference in density of two objects that allows one to be buoyant when surrounded by the other. This a balloon can float on air, A steel ship can float on water and oil can float on water.
density
Buoyancy; negative density.
A needle sink in water.
A needle can be made to float on very still water.
when water turns to ice its volume increases whilst its weight stays the same, therefore ice has a lower density than water, and this allows it to float.
the way it float is surface tension!!
Water surface tension hold the needle on the water surface.
Yes if the surface tension of the water is not broken. If you are careful you can place a needle on the surface of the water in a glass. Also if you reduce the surface tension with detergent (just a very little is enough) the needle will sink because it's density is greater than that of the water. NO (if the surface tension of the water is broken, a needle cannot float on the surface of water. This is because the needle has higher density than water (density is mass divided by volume).
Due to surface tension, the upper surface of water acts like a stretched membrane which enables it to float a swing needle.
An object will float on water if it has less density than water.
i think that vol of water underneath the needle when it is dropped on water parallely is more which prevents the needle from sinking.