The denomination hygroscopic it is derived from Greek the higros and scopien (= to attract water) and talks about all the compounds that attract water in form of steam or liquid of their atmosphere.

By this composed hygroscopic often they are used like desecantes.

Some of hygroscopic compounds react chemically with the water like hidruros or alkaline metals. Others catch as water of hidratación in their crystalline structure as it is the case of sódico sulphate.

Some examples of known hygroscopic compounds more are:

Salt by his higroscópicas properties it is used to dissolve snow.


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