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

Answer

Energy is required for a substance to change from one state to another.

When we provide heat energy to a substance, it's temperature increases. 

 

After a certain point, the temperature becomes constant. 

This is because the heat energy which was initially being used to increase the temperature is now being used to change the state of the substance (overcoming the force of attraction between the particles of the substance).

This heat is known as latent heat.

Latent Heat -Teachoo-01.jpg

  1. Class 9
  2. Chapter 1 Class 9 - Matter In Our Surroundings (Deleted)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo