How does a vapour changes into a liquid by?

Answer 1

Condensation is the change of the physical state of aggregation (or simply state) of matter from gaseous phase into liquid phase.Condensation commonly occurs when a vapor is cooled to its dew point, but the dewpoint can also be reached through compression. Water vapor will only condense onto another surface when the temperature of that surface is cooler than the temperature of the water vapor. The water molecule brings a parcel of heat with it. In order to have condensed, the molecule tranfers its kinetic energy to the atmosphere. When water vapor condenses into liquid water, the hydrogen bonds form again and release latent heat, which increases the sensible heat and causes the air temperature to rise. Sensible heat is removed from the air and the temperature drops when evaporation is occurring and latent heat is converted to sensible heat and the temperature rises when condensation occurs.