Question

while the substance transforming from liquid state to solid state the latent heat in the substaance

Answer 1

While the substance is transforming from liquid to solid state, the latent heat of fusion is produced. This heat is also referred to as enthalpy of fusion.

This latent heat of fusion is equal when substance is being converted from solid to liquid and in this case the heat is absorbed unlike when liquid is being converted to solid where heat is evolved.