sorry. my question was that we are in a boat in waterand we have got plenty of stones we throw all of them and the boat is now having no stones.now will the water level increase or decrease?
water level increases slightly but we do not observe it.
no the water decrease. but i don't know why. but it surely decreases
Yes Meghna.
The water level decreases.
This is because the volume of the water displaced is equal to the wt. of stones when the stones are in the boat. When the stones sink the volume of water displaced is much less than the weight of the stone.
Please read Archimides principle if you want to understand the concept involved.