NCERT Exemplar Solutions Class 9 Science Solutions for Matter in our Surroundings - Exercise in Chapter 1 - Matter in our Surroundings

Question 1 Matter in our Surroundings - Exercise

Which one of the following sets of phenomena would increase in raising the temperature?

(a) Diffusion, evaporation, compression of gases

(b) Evaporation, compression of gases, solubility

(c) Evaporation, diffusion, expansion of gases

(d) Evaporation, solubility, diffusion, compression of gases


The answer is c) Evaporation, diffusion, and expansion of gases


Particles of matter are continuously moving as they possess kinetic energy. When the temperature is raised particles of matter intermix with each other which is called diffusion.

Evaporation means the conversion of liquid state into the vapour state. When we increase temperature molecules move and vibrate so quickly that they escape into the atmosphere in the form of vapors.

An increase in temperature causes the molecules to move faster this results in the expansion of gases.

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