Question

What is latent heat of vaporization?

• A. Heat absorbed when a substance changes phase from solid to gas.
• B. Heat absorbed when a substance changes phase from liquid to gas.
• C. Heat released when a substance changes phase from liquid to gas.
• D. Heat absorbed when a substance changes phase from gas to liquid.

Answer 1

The correct option is B Heat absorbed when a substance changes phase from liquid to gas.

Latent heat of vaporization is the amount of heat absorbed when 1 kg of liquid changes into vapor at constant temperature. When a liquid vaporize at the normal boiling point the temperature of the liquid will not rise beyond the temperature of the boiling point.