The answer to the question yesterday is simple: water would not spill out of the glass when it melts. Aristotle had done a similar experiment thousands of years ago.
Why ? Because when some water freezes to become an ice cube, its volume expands. (That's why it floats.) The volume of water displaced by a free floating iceberg is exactly the same in weight - and hence volume - when the latter melts.
And, when the temperature rise to 4-degree, water level actually falls because it is the temperature at which water shrink to the smallest volume.
Oh, haven't you heard of this ? Go and read <十萬個為什麼> !
PS. Of course if the ice is not free floating but lying on a piece of land, there would be problem when it melts. In that sense the South Pole is more of a problem than the North.
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