Matter in our Surrounding

     

Heat involved in phase change

 Latent Heat of Fusion  (lf)
Amount of heat required for changing 1 k.g. of substance from solid to liquid. Amount of heat required to change m k.g. of solid to liquid = mlf.

Q= mlf

Latent Heat of Vapourisation   (lv)
Amount of heat required to change 1 k.g. of substance from liquid to gas. Amount of heat required to change m k.g. of solid to liquid = mlv.

Q= mlv