Question 986489
Explain the expansion/contraction of water:
a.) at 4 degrees Celsius
b.) above 4 degrees Celsius
c.) below 4 degrees Celsius
d.) below freezing point (0 degree Celsius)
What is so special about water at 4 degrees Celsius? Does it have any significance? 
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The density of water is greatest at 4 deg C.
It expands as the temperature increases or decreases.
Its coeff of expansion is greater below 4 C than above.
That's why ice floats in water regardless of the temperature of the liquid water.