A cube of ice is suspended in vacuum inside a hall under gravity-free conditions. As the ice melts, the resulting water

keeps its original cubical shape
loses its cubical shape
drops to the floor of the hall
rises toward the ceiling

Correct answer: loses its cubical shape

Solution

In a gravity-free environment there is no weight, so the molten water is shaped only by surface tension, which tends to minimize surface area. The cube collapses into a spherical droplet, so it changes its cubical shape; it neither falls nor flies.

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