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Get Answers to all your Questions
Which of the following is correct about latent heat of fusion and latent heat of vaporisation
Option: 1
Latent heat of fusion = latent heat of vapourisation
Option: 2
Latent heat of fusion < Latent heat of vapourisation
Option: 3
Latent heat of fusion > latent heat of vaporisation
Option: 4
None
Answers (1)
Latent heat:
- The heat energy which has to be supplied to change the state of a substance is called its latent heat.
- Latent heat does not raise the temperature.
- But latent heat has always to be supplied to change the state of a substance.
- The word 'latent' means hidden.
- The latent heat which we supply is used up in overcoming the forces of attraction between the particles of a substance during the change of state.
Latent heat is of two types:
- Latent heat of fusion
- Latent heat of vaporization
Latent heat of fusion
- The heat which is going into ice but not increasing its temperature is the energy required to change the state of ice from solid to liquid.
- The heat energy is used up in changing the state of the solid substance by overcoming the force of attraction between its particles.
Latent heat of vaporization
- The heat energy supplied to a boiling liquid is used up in changing the state of the liquid substance by overcoming the force of attraction between its particles.
- When water changes into steam, it absorbs latent heat, but when steam condenses to form water, an equal amount of latent heat is given out.
More volume expansion takes place in vaporisation than fusion hence
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