What is the phase change from solid to liquid called?

What is the phase change from solid to liquid called?

• A. Melting
• B. Freezing
• C. Condensation
• D. Vaporization

Answer: (A)

Melting is the phase change from a solid to a liquid. When heat is added to a solid, its particles gain energy and begin to move more freely, weakening the forces that hold them in a fixed lattice. At the melting point, those particles slide past one another, forming a liquid. This process requires energy called the latent heat of fusion. The other terms describe different changes: freezing is liquid turning into a solid, condensation is gas turning into a liquid, and vaporization is liquid turning into a gas.

Melting is the phase change from a solid to a liquid. When heat is added to a solid, its particles gain energy and begin to move more freely, weakening the forces that hold them in a fixed lattice. At the melting point, those particles slide past one another, forming a liquid. This process requires energy called the latent heat of fusion. The other terms describe different changes: freezing is liquid turning into a solid, condensation is gas turning into a liquid, and vaporization is liquid turning into a gas.