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What is the term for when a substance changes from gas to solid without becoming liquid?

Condensation

Sublimation

Deposition

The term that describes the process of a substance changing directly from a gas to a solid without going through the liquid phase is deposition. This phenomenon often occurs under specific conditions, such as when water vapor in the air turns directly into frost on a cold surface, bypassing the liquid water stage. It involves the loss of energy and is an important concept in physical chemistry and the study of phase transitions.

When considering the other terms: condensation refers to the process where gas transforms into a liquid, which is not applicable here. Sublimation is the process where a solid changes directly into a gas, while freezing pertains to a liquid turning into a solid. Neither of these processes aligns with the definition of a gas transitioning directly into a solid. Therefore, deposition is the accurate term for this specific transformation.

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Freezing

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