Which term describes the change of state from a liquid to a gas?

Which term describes the change of state from a liquid to a gas?

• A. Vaporization
• B. Condensation
• C. Conduction
• D. Convection

Answer: (A)

Vaporization is the change from a liquid to a gas. It happens when the molecules in a liquid gain enough energy to overcome the attractive forces holding them in the liquid, allowing them to escape into the air. This energy input can occur at the surface as evaporation, which can happen at any temperature, or throughout the liquid during boiling when the liquid’s vapor pressure reaches the surrounding pressure. Vaporization requires heat, the energy known as the heat of vaporization. This process is different from condensation, which is gas turning back into a liquid, and from conduction and convection, which are ways heat is transferred rather than a phase change.

Vaporization is the change from a liquid to a gas. It happens when the molecules in a liquid gain enough energy to overcome the attractive forces holding them in the liquid, allowing them to escape into the air. This energy input can occur at the surface as evaporation, which can happen at any temperature, or throughout the liquid during boiling when the liquid’s vapor pressure reaches the surrounding pressure. Vaporization requires heat, the energy known as the heat of vaporization. This process is different from condensation, which is gas turning back into a liquid, and from conduction and convection, which are ways heat is transferred rather than a phase change.