Question

Define latent heat of fusion and vapourisation. Why does tempeature remian constant during the chane of state of substances? Why is it needed?

Answer 1

hey!!

_________

☆Answer:-

__________

•defination:-

• The latent heat of fusion and vaporization both involve the heat required to change the state of a substance without a change in temperature. In the case of the latent heat of fusion it is the heat required to change a substance from a solid to a liquid..

_____________________________________________________________

☆why its is needed:-

___________________

• The energy required to completely separate the molecules moving from liquid to gas is much greater that if you were just to reduce their separation solid to liquid. Hence the reason why the latent heat of vaporization is greater that the latent heat of fusion.

_________________________________

☆why temperature remains constant:-

__________________________

• During Fusion the body loses energy by forming bonds and in this process the temperature does not change because there is no change in energy of the particles.

• During Vaporization the energy supplied is used for breaking bonds between the molecules and the particles do not absorb energy.

_________________________________________

This is the reason behind the temperature being constant in phase transitions.

hope hlp u!!

____________

Answer 2

Answer:

latent heat of fusion

the latent heat of fusion encompasses the process of adding heat to melt a solid and the process of subtracting heat to freeze a liquid.

latent heat of  vapourisation.

Latent heat of vaporisation it is the energy (heat) required to transform a liquid mass at the boiling point (for example, water at 100°C at normal pressure) from liquid to gas.

Explanation:

During Fusion, the body loses energy by forming bonds and in this process the temperature does not change because there is no change in energy of the particles.

During Vaporization, the energy supplied is used for breaking bonds between the molecules and the particles do not absorb energy, So the temperature remains constant.

This is the reason behind the temperature being constant in phase transitions.