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What is physical evaporation?

What is physical evaporation? Describe the steps in briefly as following:

Physical evaporation is to heat the substance to volatilize and then deposit its vapor on a predetermined substrate.

Because the evaporation source must be heated and volatilized and under condition of vacuum, it is so called hot or vacuum evaporation.

 It can be divided into 3 steps as below:
(1)  The condensed matter is heated and volatilized into a vapor phase
(2)  Steam moves in the air for a distance to the substrate
(3)  Steam is cooled and condensed into film on the substrate

Post time: Jul-20-2020
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