Question

Why water has its highest density value at 4 degree Celsius not at 0 degree Celsius?

Answer 1

Explanation:

The molecules of the water are closer together, and this increases the density of the liquid. As the temperature of warm water decreases, the water molecules slow down and the density increases. At 4 degree Celsius clusters start forming. Cluster formation is the big effect and density starts to decrease. That's why the density of water is 4 degree Celsius not 0