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Sublimation is the transition of a substance from a solid to a gas state without passing through a liquid state. When a substance's triple point on its phase diagram, which corresponds to the lowest pressure at which the substance can exist as a liquid, is achieved, sublimation occurs. The reverse of sublimation, in which a substance changes from a gas to a solid state, is called deposition or desublimation.

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Sublimation experiment is the transition of a substance directly from the solid to the gas state , without passing through the liquid state. The reverse process of sublimation is deposition or de sublimation, in which a substance passes directly from a gas to a solid phase.