Question

why a bowl float in water and a needle sink

Answer 1

Because bowl is generally of plastic and needle is having metal.

Answer 2

Heya Mate,

Good Morning.. :)

A needle sinks in water because it has a density more than that of water, whereas a bowl floats on water because the inner part of bowl is hollow and contains air in it, which makes it possible to float.

Hope this helps you.. :)