At low relative humidities, moisture consists mainly of adsorbed water.
2.
They may be flame-dried to remove adsorbed water.
3.
These spectral ranges and resolving powers are sufficient to provide surface maps of mineralogical and molecular components including carbonates, silicates, sulfates, oxides, adsorbed water and a wide range of organic compounds.
4.
A hypothesis proposes that the needed water could originate in the seasonal oscillations of near-surface adsorbed water provided by the atmosphere; perchlorates and other salts known to be present on the surface, are able to attract and hold water molecules from the surrounding environment ( hygroscopic salts ),