Question

what is the physical state of water at-
a) 25 °C
b) 0°C
c) 100°C​

Answer 1

Answer:

the physical states are as follows:

a) liquid

b) ice

c) gas

Answer 2

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(a) Water at room temperature is a liquid. (b) an iron almirah is a solid at room temperature. Answer: (a) water at room temperature is liquid because at this temperature (i)it has fixed volume and (ii)it can flow.

Water

We know that water exists in all three states of matter.

Water exists as ice in solid form, as water in liquid form, and vapour as gaseous form.

These interconversion of states of matter are visible to a common man in his day to day life.

So let us see at what suitable temperature the water exists in all these three forms:

1. 25 º C

• Water at 25°C is present in the liquid state.

• The water which we use for our day to day activities is in the liquid state.

• The water which we use for drinking, cooking, washing, etc all are in a liquid state.

2. 0ºC

• At 0°C, water exists in solid-state.

• We know that the freezing point of water is 0 °C.

• The liquid form of water starts to become solid (ice) at this temperature.

• Example: If you keep an ice cube tray filled with water and freeze it for a few hours, you may observe the cubes where you poured water has become solid. Ice is the solid-state of water.

3. At 100ºC

• At 100°C, water exists in a Gaseous state.

• We know that the boiling point of water is 100°C.

• The water starts to evaporate after attaining this high temperature.

• Example: When you boil water at your home after some time you observe the vapours coming out of the vessel. These vapours are the gaseous state of water.

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