Question

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

Answer 1

Physical State of Water at Different Temperatures 

Water can exist in different physical states (solid, liquid, gas) depending on the temperature. Here’s how the physical state of water changes at the following temperatures:

Temperature	Physical State of Water
25°C	Liquid
0°C	Solid (Ice) / Liquid (At the melting point)
100°C	Gas (Steam) / Liquid (At the boiling point)

Explanation:

(a) At 25°C: Water is in the liquid state because it is above the freezing point (0°C) but below the boiling point (100°C).

(b) At 0°C: Water can exist as both a solid (ice) or a liquid at this temperature, as it is at the melting point. Ice and water are in equilibrium at this temperature.

(c) At 100°C: Water is in the gas phase (steam) when it reaches its boiling point, but it can also exist as a liquid at this temperature if it is under pressure (e.g., in a pressure cooker).