The latent heat of fusion of a substance is the amount of energy associated with doing which of the following to 1 kg of the substance Melts at it at its melting point, therefore the correct option is A.
The heat energy required for the change of phase of any substance is known as latent heat of that substance for a particular change of phase or process. There are various kinds of latent heat such as the latent heat of evaporation when liquid changes to vapor form by absorbing the given heat from any external source at its boiling point.
Similarly, the latent heat of fusion is used when any substance melt at its melting point to change the liquid phase of that substance.
When 1 kg of the substance Melts at its melting point the amount of energy is associated with the latent heat of fusion of a substance. therefore the correct option is A.
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