Correct Answer: Condensation

Solution : The correct answer is Condensation .

The physical state of matter changes from the gas phase to the liquid phase during condensation , which is the opposite of vapourisation . The creation of atomic/molecular clusters of that species within its gaseous volume—similar to the formation of a raindrop or snowflake within clouds—or the point at which such a gaseous phase comes into contact with a liquid or solid surface is what starts condensation.