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When a substance passes directly from a solid to a gaseous state upon heating, it is said to undergo sublimation. This process occurs without the substance first becoming liquid, and is commonly observed in materials like dry ice (solid carbon dioxide) and iodine. Sublimation typically occurs under specific temperature and pressure conditions where the solid's vapor pressure exceeds atmospheric pressure.

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2mo ago

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When a substance goes directly from a gaseous state to solid state as dry ice does?

When a substance changes directly from solid state to gaseous state without changing to the liquid state, it undergoes sublimation. Examples of substances which sublime include dry ice and ammonium chloride. ================================== Another contributor continued: The process is considered to be unusual among various substances, but the truth is that it's rare only under the conditions in which human beings live, i.e., normal air pressure. There is a threshold of pressure for every substance above which the substance has no liquid phase, and passes directly between the solid and gaseous phases. Example: Above a pressure of about 214 atmospheres (3,120 pounds per square inch), water doesn't exist. At that pressure, ice thaws directly to steam at 373° C (703° F), just as dry ice does at room temperature and pressure..


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