Phase change from solid directly to gas.

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Multiple Choice

Phase change from solid directly to gas.

Explanation:
Sublimation is the phase change that turns a solid directly into a gas. It happens when the solid gains enough energy that its molecules can escape into the vapor phase without first becoming a liquid, typically under conditions where the solid’s vapor pressure exceeds the surrounding pressure (often below the substance’s triple point). A classic example is dry ice (solid CO2), which at room temperature and normal pressure sublimates directly into CO2 gas. For comparison, melting is solid to liquid, deposition is gas to solid, and condensation is gas to liquid, so those pathways do not describe a direct solid-to-gas transition.

Sublimation is the phase change that turns a solid directly into a gas. It happens when the solid gains enough energy that its molecules can escape into the vapor phase without first becoming a liquid, typically under conditions where the solid’s vapor pressure exceeds the surrounding pressure (often below the substance’s triple point). A classic example is dry ice (solid CO2), which at room temperature and normal pressure sublimates directly into CO2 gas.

For comparison, melting is solid to liquid, deposition is gas to solid, and condensation is gas to liquid, so those pathways do not describe a direct solid-to-gas transition.

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