Ice. It expands when it's 0 degrees Celsius.
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At 4 degrees Celsius, ice is less dense than water. This is due to the unique crystal structure of ice that causes it to occupy more space, making it less dense than liquid water.
Liquid water is most dense at 4 oC, with a density of 1.00g/cm3. Water at higher or lower temperatures is less dense. Ice is less dense than water at 4 oC, also.
Ice is less dense than water at a temperature of 4 degrees Celsius. This is because the hydrogen bonds in water cause the molecules to be more spread out and less tightly packed compared to when it is in a solid state as ice.
The lowest density in water occurs at 4 degrees Celsius, where water is most dense. As water cools below or heats above this temperature, its density decreases, causing it to expand and become less dense.
As water is cooled, its density increases until it reaches its maximum density at 4 degrees Celsius. Below 4 degrees Celsius, water begins to expand as it freezes, which is why ice is less dense than liquid water.
9 degrees less than 0 degrees Celsius is -9 degrees Celsius.
9 degrees less than 2 degrees Celsius would be -7 degrees Celsius.