Question

i will give everyone a medal that tryies to genuinly respond to this question.
an ice cube floats in a glass of water, the glass is completely full - another drop of water will cause it to overflow. what will happen to the water level in the glass as the icecube melts?

Answer 1

Ice is an expanded form of frozen water, so I would guess that as it melts, it will not overflow. The water level might actually decrease.

Answer 2

it will increase

Answer 3

Try this experiment. Take a ziploc bag and fill it partially with water. Tape the bag to the back of your freezer and mark with a permanent marker where the water line is. Come back once the water has frozen and mark where the top of the frozen water is. As water gets colder, the space between the molecules increases so the volume of the ice is actually larger than the volume of the water. The reverse is also true. If you were to remelt your bag of ice, the water line would move back down to the first line. So for your question, as the ice cube melts the water line would decrease.

This is only true for water. Most other liquids shrink as they freeze. Water does this because it is polar and because it forms hydrogen bonds.