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Sublimation and deposition

Sublimation is the direct change of a solid to a gas without passing through the liquid phase. An example is dry ice, which sublimates from solid carbon dioxide to carbon dioxide gas at room temperature. Deposition is the opposite process where a gas changes directly to a solid without first becoming a liquid, such as snow forming from water vapor in clouds. Sublimation and deposition allow purification of compounds through changing and condensing phases without melting or freezing.

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Sublimation and deposition
What is Sublimation?Sublimation is the process where a solid changes phase and turns directly into gas without passing through a liquid phase. Sublimation, passing the liquid phraseSolidSolidLiquidGasCondensationMeltingFreezingEvaporation
PurposeWhat’s the ultimate purpose of Sublimation??Sublimation is like distillation, which involves heating the compound at low pressure from one apparatus and condensing it in another to purify the compound. Example of Sublimation Set-upExample of Distillation set-up
ExamplesCarbon Dioxide is a common example of a chemical compound that sublimates at atmospheric pressure- dry ice at room temperature and one atmosphere temperature will turn into gas without becoming into a liquid.Dry Ice reacting>>
Effects Sublimation also causes side effects such as Freezer Burn. Freezer Burn is a condition that occurs when frozen food has been damaged by dehydration, due to air reaching the food. It appears as grayish-brown . When the constantly vibrating water molecules in the meats and vegetables stored in the freezer migrate to the surface, crystals of ice outside of the solid food are formed. The parts now deprived of moisture become dry and shriveled and look burned.
Deposition
What is Deposition?Deposition is a process where a gas changes phase and turns directly in solid without passing through the liquid phase. It’s also the opposite of sublimation.
ExampleOne extremely common example is snow that formed in clouds. Water vapor changes directly to ice without first becoming a liquid. 
Done by: Tan Wei Heng 1p3 (24)Sources: Wikipedia. Sublimation (phase transition)http://en.wikipedia.org/wiki/Sublimation_(phase_transition)Wikipedia. Deposition(chemistry) http://en.wikipedia.org/wiki/Deposition_(chemistry)