Hygroscopic

Able to absorb moisture from air.

Example: sodium hydroxide pellets are so hygroscopic that they dissolve in the water they absorb from the air.

Cloud condensation nuclei are typically hygroscopic, consisting of salts that produce aqueous solutions that have equilibrium vapour pressures less than those for pure water at the same temperature.

See also: Air, Efflorescent, Water.

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Subjects: Chemistry