A needle sink in water.
the way it float is surface tension!!
Water surface tension hold the needle on the water surface.
i think that vol of water underneath the needle when it is dropped on water parallely is more which prevents the needle from sinking.
It will float if placed carefully enough.
A needle sink in water.
A needle can be made to float on very still water.
the way it float is surface tension!!
Water surface tension hold the needle on the water surface.
Due to surface tension, the upper surface of water acts like a stretched membrane which enables it to float a swing needle.
i think that vol of water underneath the needle when it is dropped on water parallely is more which prevents the needle from sinking.
Surface tension
It will float if placed carefully enough.
Surface tension
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).
Because the detergent reduces the surface tension of the water.
The total weight of the surface area of a boat is less than than the weight of a body of water of the same size (buoyancy), so that is why it floats. A needle sinks because a body of water with the same size is lighter than the needle. Note: It is entirely possible to float a needle on water. It requires a bit of doing, but it can be done.