1. The problem statement, all variables and given/known data A big ice cube is placed in a small glass of water. The level of water in the glass is marked. When the ice cube melts completely,the overall water level will remain the same. Explain. 2. Relevant equations Upthrust= weight of fluid displaced 3. The attempt at a solution Since the ice floats,weight of fluid displaced is equal to the weight of ice itself. Since upthrust equals to weight of fluid displaced, it is equals to density of ice times volume of ice times gravitational force times area. Since the volume of ice is unchanged before and after melting, the water level remains the same.