Which of the following processes converts liquid directly into its vapour form?

The correct answer is Vaporisation.

• Vaporisation converts liquid directly into its vapour form.
  • Vaporization of an element or compound is a phase transition from the liquid phase to vapour.

Additional Information

• Condensation: The process by which water vapour in the air is changed into liquid water is called condensation. 
  • This caused the water vapour to condense, or turn into its liquid form.
  • Condensation is crucial to the water cycle because it is responsible for the formation of clouds.
• Vaporation: It is the process by which a liquid substance is converted into its gaseous phase or vapor. This transformation occurs when molecules within the liquid gain sufficient kinetic energy to overcome the intermolecular forces holding them together in the liquid phase. As a result, they escape from the liquid's surface and enter the surrounding space as vapor.
• Sublimation: It is the conversion of a solid directly into vapors.
  • Sublimation takes place when the boiling point is less than the melting point.
  • The heat required to change a unit mass of solid directly into vapors at a given temperature is called the heat of sublimation at that temperature.