Question

If you fill a glass to the brim with ice water and the ice melts, what will happen?

Answer 1

Answer:

The water level will drop slightly as the ice melts.

Explanation:

One interesting property of water is that it achieves maximum density as a liquid, not as a solid. So, ice is less dense than water and floats. When it melts, it becomes more dense. More mass per unit volume means the level of the liquid drops slightly.

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Answer 2

Explanation:

When the cube melts, the surrounding liquid can move into the space it filled. If the glass contains only ice and water, it will not overflow because the amount of extra water will be equal to that previously displaced by the cube(s).