What is the process of conversion of solid state directly to gaseous state called?
Sublimation
The direct conversion of a solid to a gas (skipping the liquid phase) is called sublimation. It occurs when the substance's vapour pressure exceeds atmospheric pressure below its melting point.
Common examples include dry ice (solid CO2), camphor, naphthalene balls, and iodine. Evaporation is liquid to gas, condensation is gas to liquid, and distillation is a separation technique using vaporisation followed by condensation.
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