Question

What is the physical state of water at 0'c

Answer 1

If this is a question relating to middle school science classes, then the simple answer is that the water is in a solid state as ice at 0 Celsius.

Complicated answer below:

I assume you mean at standard pressure, at which 0 Celsius is the freezing point of water.

The answer is: it depends.

State changes are kind of weird in that they require energy. If the water is already frozen as ice, then heat added to the ice will cause it to increase in temperature until 0 Celsius. At that point, additional heat added to the system is used as energy for the state change to liquid water. The ice cannot exist at a temperature greater than that, but at the same time the water cannot exist until enough energy has been added to transition the mass of ice into liquid.

So if energy of the system is exactly enough to make the temperature of the ice 0 and no more, then no state change will occur.

Likewise, if you start as liquid water and lower the temperature, you are removing energy from the system. So if you remove exactly enough energy to make the temperature of the water 0, but do not remove the amount of energy that would be liberated from the system during a liquid to solid phase transference, no state change will occur.

Answer 2

hey!! here is it answer!!
physical state of water at 0'c is solid...