How does the presence of ice in a refrigerator cools the products stored in it?

The heat is always transferred from a hotter substance to a colder substance, that is, from the products stored in the refrigerator to the ice. By absorbing this thermal energy, the ice melts, transforming itself into water. The water flows by gravity, carrying with it the latent heat of fusion. Each kilogram of ice that melts absorbs 80 kilocalories (each pound of ice that melts absorbs 144 Btu).