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Evoporation,Vapourization and Latent heat -Class 9 CBSE notes


Evaporation, Vapourization, and Latent heat



Evaporation, Vapourisation, and latent heat are the transitional phenomena of the substances, if class 9 students couldn’t clear so far their doubts on these terms, now, here just go through the whole post and that’s it, your concept on the terms would be cleared.

Vapourization: The transformation of the liquid to gas is known as vaporization, vapourisation of liquid occurs when liquid gets energy from the surroundings. Vapourisation is of two kinds,(i) Boiling (ii) Evaporation

(i) Boiling: When heat is given to a liquid and its all molecules are excited enough to leave the surface of the water, then it is known as boiling, the temperature of the liquid at which the vapor pressure of the liquid is equal to atmospheric pressure is known as boiling point. The transformation of liquid to vapor at its boiling point is known as boiling

(ii) Evaporation: Transformation of liquid to vapor under its boiling point is known as evaporation. The rate of vaporization is effected by the surrounding factors like heat, wind, and humidity. You can observe this phenomenon when sun heat is neglected but due to the blow of air clothes are dried up,it is because moving air absorbs water molecules from the surface of the clothes.

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Latent Heat. Latent heat is also known as hidden heat, as we know the particles of matter are bonded by a force of attraction to each other, When the state of matter changes from a solid to liquid state or liquid to the gaseous state, extra heat is needed to breakdown the force of attraction between the particles of the matter. If we place a thermometer into a mass of ice contained in a pan and allow a flame of heat on the bottom of the pan, the temperature of the thermometer is unchanged means it remains on 0º C temperature until the whole of the ice is converted into the water. The heat imparted to ice is utilized to overcome the force of attraction between the particles of ice, this heat is known as the latent heat of fusion. The latent heat of vaporization is the heat used to break up the force of attraction between particles of liquid. As an example, if we place a thermometer into water contained in a pan, then the temperature of the water remains unchanged until the water starts to vapourize. The heat given to water is utilized to overcome the force of attraction between the particles of water.


Related questions

Q1.Why is the water of an earthen pot becomes cool in summer?

Q2.Who gives more cooling effect to your palm a 0ºC ice or 0ºC water and why?

Q3. Why do your palm becomes cool after placing a few drops of kerosene on it?

Q4.Why does a desert cooler gives cool air during the summer?

Q5. Who is more dangerous 100ºC vapour or 100ºC water and why?

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