sublimatsioonipunkti

Sublimatsioonipunkti is a term used in chemistry and physics to describe a specific temperature and pressure condition. At the sublimation point, a substance can transition directly from the solid phase to the gas phase without passing through the liquid phase. This phenomenon is known as sublimation. Conversely, at the same pressure, a gas can transform directly into a solid, a process called deposition or desublimation.

The sublimation point is not a single temperature but rather a pressure-dependent value. For any given substance, there is a unique triple point where solid, liquid, and gas phases can coexist in equilibrium. Below the triple point pressure, a substance will sublime. Above the triple point pressure, it will melt into a liquid when heated and boil when heated further. The sublimation curve on a phase diagram represents the pressures and temperatures at which sublimation occurs.

Common examples of substances that exhibit noticeable sublimation include dry ice (solid carbon dioxide) at atmospheric pressure and iodine crystals. The concept of the sublimation point is crucial in understanding phase transitions and is applied in various scientific and industrial processes, such as freeze-drying, where water is removed from a substance by sublimation.