What kind of changes are melting and boiling?

Answer 1

Melting is a phase change where solid becomes a liquid. The latent heat of fusion must be supplied to produce phase change from solid to liquid. About 144 Btu must be supplied to change 1.000 pound of ice at 32 degrees F to 1.000 pound

of liquid water at 32 degrees F.

Boiling is a phase change where a liquid becomes a vapor. The latent heat of vaporization must be supplied to change a boiling liquid to a vapor. For water

boiling at 14.7 psia ,970.3 Btu of heat must be supplied to change 1.000 pound

of boiling liquid water to vapor.

Answer 2

Melting is the change from a solid to a liquid, while boiling is the change from a liquid to a gas. Both are physical changes that involve the absorption or release of energy.