When a solid changes directly into a vapor without passing through the liquid state is a physical change called sublimation.
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Sublimation is the process when a solid changes directly into a gas without first becoming a liquid. This occurs when the conditions are such that the solid phase can bypass the liquid phase and enter the gas phase.
A vapor changing into a solid goes through a process called deposition. One example of this process is frost forming on leaves.
The process of a liquid changing into a gas is called evaporation. In the case of water changing into water vapor, it is specifically known as vaporization.
Examples of a gas changing directly into a solid (deposition) - Water vapor in a cloud changing into solid snowflakes. Water vapor in the air turning directly to frost on any sub-freezing surfaces.
This process is called sublimation. It occurs when a solid substance changes directly into a gas without passing through the liquid state. Sublimation is a physical change driven by the solid substance's vapor pressure exceeding the surrounding pressure.
The term used for the conversion of solid to vapor is sublimation.