Question

of the following choices, choose the correct word that best represents a
a. a transition from liquid phase to vapor phase
b. a transition from vapor phase to liquid phase
c. a transition directly from vapor phase to solid phase
d. a transition from liquid phase to solid phase
vapor pressure
melting
boiling
freezing

Explanation:

Vapor pressure is a property related to the vapor - liquid equilibrium. Melting is the transition from solid to liquid. Boiling is the transition from liquid to vapor phase. Freezing is the transition from liquid to solid phase. The description in option A corresponds to boiling.

Answer:

boiling