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The form of the cooled surface often is a so-called cold finger which for very low-temperature sublimation may actually be cryogenically cooled. If the operation is a batch process , then the sublimed material can be collected from the cooled surface once heating ceases and the vacuum is released.
Sublimate also refers to the product obtained by sublimation. [2] [3] The point at which sublimation occurs rapidly (for further details, see below) is called critical sublimation point, or simply sublimation point. Notable examples include sublimation of dry ice at room temperature and atmospheric pressure, and that of solid iodine with heating.
This sublimation occurs at rates of 3–350 centimetres per year (1.2–137.8 in/year) snow water equivalent and is balanced by ice flow, with the sublimation rate decreasing with elevation [20] and increasing with temperature. Summer also increases the sublimation rate, although it still occurs during winter. [22]
Cold finger used in sublimation.The raw product (6) is in the bottom of the outer tube (4) which is heated (7) while under vacuum (through side-arm 3). The sublimated material collects (5) on the cold finger proper, cooled by a coolant (blue) circulated through ports 1 and 2.
That is, any snow that falls in that area is counteracted by sublimation or other losses. Such areas are known as blue-ice areas . [ 3 ] These areas have been used as runways (e.g. Wilkins Runway , Novolazarevskaya , Patriot Hills Base Camp ) due to their hard surface, which is suitable for aircraft fitted with wheels rather than skis .
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