A piece of ice is floating in a vessel containing water and inside the ice is a bubble of air. What will be the effect on the level of water, when the ice melts?

Explanation

The level of water remains the same. It is so because for a floating ice, the weight of ice is equal and opposite to the weight of the water displaced by the immersed part of ice in water. When the ice melts, the water formed must be of volume which was displaced by the immersed part of the ice.