2007-01-22 11:40:33 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Because it expands.
2007-01-22 11:43:17 · answer #1 · answered by lonebear76 3 · 0⤊ 0⤋
The reason for this is because the sides, bottom and top freeze first since they are in more direct contact with the cold. This leaves liquid water in the center of the cube. As that unfrozen water eventually freezes, it expands as all water to ice transformations do. The expansion has only one way to go...up. For this reason, the top side of the ice cube will always have a slightly rounded appearance where the center is higher than the perimeter.
2007-01-22 19:46:26 · answer #2 · answered by jimmyjames 3 · 0⤊ 0⤋
Water expands when it freezes. The outer portion of the cube that is touching the tray freezes first. By the time the middle is cold enough to freeze and expand it can only go up as it is forced out.
2007-01-22 19:46:46 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Water expands as it freezes. The sides of the container prevent it expanding outwards or down, so the only way it can go is up. A two-dimensional analogy to this three-dimensional one is to squeeze the ends of a steel strip together. It bulges outwards.
2007-01-22 19:49:25 · answer #4 · answered by zee_prime 6 · 0⤊ 0⤋
water freezes and expands at 32 degrees.
2007-01-22 19:43:54 · answer #5 · answered by Anonymous · 0⤊ 0⤋