When a solid substance disappears completely as a gas on heating, the substance is said to have undergone
Answer Details
When a solid substance disappears completely as a gas on heating, the substance is said to have undergone sublimation. Sublimation is the process by which a solid changes directly into a gas without passing through the liquid state. This is due to the fact that the substance's vapor pressure is high enough to overcome the atmospheric pressure at its melting point, causing it to transition directly from the solid to the gaseous state. Examples of substances that undergo sublimation include dry ice (solid carbon dioxide), mothballs (naphthalene), and camphor. Evaporation, on the other hand, is the process by which a liquid changes to a gas or vapor below its boiling point, while distillation and crystallization are methods of purifying substances.