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Deposition is the process in which a gas changes directly to a solid.

At the proper conditions the thermodynamic equilibrium will be between solid and gas rather than solid/liquid or liquid/gas. Under these conditions it is thermodynamically unfavorable to form a liquid phase. As an example - anything below the triple point of water will only allow solid/gas equilibrium.

For example:

Iodine vapours when condensed at 1 atmosphere pressure change directly to solid iodine.

Frost will form on the windshield of a car

Note: the reverse process of changing directly from solid to gas is called sublimation. Sublimation is NOT the process of Gas --> Solid. That would be like confusing melting with freezing or confusing boiling with condensing.

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Loma Schowalter

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3y ago

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