Looks to me like PCY is right.
Assume:
Density of water is 1 kg/L (at 4 degrees C))
Density of ice is about 0.920kg/L
Density of air is about 0.001kg/L
Density of iron is about 7.8 kg/L
I apologize ahead of time for the metric units. :-)
First case:
If we freeze 1000kg of water, we...
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