Which process changes a solid directly into a gas?

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Multiple Choice

Which process changes a solid directly into a gas?

Explanation:
Sublimation is the solid turning directly into a gas. This happens when the solid’s molecules have enough energy, and the surrounding pressure is low enough, that molecules escape into the vapor phase without first forming a liquid. Dry ice (solid CO2) at room temperature is a classic example. The other listed processes involve intermediate or opposite transitions: melting is solid to liquid, condensation is gas to liquid, and deposition is gas to solid.

Sublimation is the solid turning directly into a gas. This happens when the solid’s molecules have enough energy, and the surrounding pressure is low enough, that molecules escape into the vapor phase without first forming a liquid. Dry ice (solid CO2) at room temperature is a classic example. The other listed processes involve intermediate or opposite transitions: melting is solid to liquid, condensation is gas to liquid, and deposition is gas to solid.

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