Final answer:
Ice melting in a glass of water does not cause the water level to overflow because the volume of melted ice corresponds to the water it previously displaced while solid.
Step-by-step explanation:
When ice melts in a glass of water, the water level will not overflow. This is because ice has a lower density than liquid water due to its crystalline structure, which means it displaces more water than it contains when it melts. As the ice turns to liquid form, it takes up less space, exactly the space it had displaced as a solid, therefore, not increasing the overall water level of the glass. This principle is based on the concept of Archimedes’ principle, which states that the upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid that the body displaces.