HOT WATER FREEZES MORE FASTER THAN COLD WATER ....

The hot water freezes faster than cold water. This means that the hot

water's temperature is more likely to cool to temperatures below zero

degrees Celsius. In the cold non-supercooled water, ice crystals form

and float to the top, forming a sheet of ice over the top of the water,

creating an insulating layer between the cooler air and the water. This

ice sheet alsostops evaporation. In the hot water that has become

supercooled (thus, no longer hot) the water, when it does freeze,

freezes throughout, creating more or less of a slush before freezing

solid.
Why is hot water more likely to be supercooled? Because hot water is

less likely to contain tiny gas bubbles. Gas bubbles form from

dissolved gasses as the water cools. When the hot water was heated,

these dissolved gasses may have been driven out. In cold water, ice

crystals use the tiny bubbles as starting points for formation (in

physics, we call them nucleation points). But in the hot water, there

are no bubbles, so there aren't as many starting points for the ice

crystals.