Question

What is the physical state of water (a) at 0°C ?
(b) at 25°C ?
(c) at 100°C ?
(d) at 250°C ?

Answer 1

a)solid and liquid

b)liquid

c)liquid and gas

d)gas

Explanation:

The physical state of water keeps varying from 0°C to 100°C.

• So starting from 0°C. Initially the state of water wood be in solid state.
• This state is usually called ice.Upon the supplying the latent heat of solidification we can obtain liquid state of water at 0°C.
• Now that we have water at 0°C we are gonna have the same state liquid till 100°C.
• So the intermediate temperature 25°C also water would be in its liquid state.
• At 100 °C again water would be in  transition state.When the required latent heat of vapourization is given the liquid state of water gets converted to gaseous state.
• Now for all temperature abow 100°C we will be having steam which is gaseous state.
• So at 250°C we will be having gaseous state.

Answer 2

Change of State is $Solid --> Liquid --> Gas$

Explanation:

(a) The physical state of water ($H_2O$) (a) at 0°C can be either Solid or liquid

(b) At 25°C, the physical state of water ($H_2O$). is Liquid.

(c) At 100°C, The physical state of water ($H_2O$) is either a liquid or gas (steam)

(d) The physical state of water at 250°C is a gaseous (steam) state because the boiling point of water ($H_2O$) is 100°C.  

The change of state is from $SOLID --> LIQUID --> GASEOUS$