A glass vessel, completely filled with water and tightly sealed, is left in a freezer for hours. What is most likely to happen?

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1. A glass vessel, completely filled with water and tightly sealed, is left in a freezer for hours. What is most likely to happen?

The water freezes and the ice level drops slightly

The water simply does not freeze at all

The glass vessel cracks, since water expands as it freezes

Nothing changes, since sealed water cannot freeze

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Water is unusual: it expands as it freezes into ice, rather than contracting like most substances. In a sealed, completely full vessel, that expansion has nowhere to go and can crack the glass.