NCERT Solutions for Chapter: Matter in Our Surroundings, Exercise 3: Questions

Convert the following temperature to Celsius scale:
(a) $300 \mathrm{K}$
(b) $573 \mathrm{K}$

What is the physical state of water at?
(a) $250 {}^{\mathrm{o}}\mathrm{C}$
(b) $100 {}^{\mathrm{o}}\mathrm{C}$

For any substance, why does the temperature remain constant during the change of state?

Suggest a method to liquefy atmospheric gases.