Editing Anhydrous (section)

{{short description|Waterless substance}}
{{More citations needed|date=June 2010}}
A substance is '''anhydrous''' if it contains no [[water]]. Many processes in chemistry can be impeded by the presence of water; therefore, it is important that water-free reagents and techniques are used. In practice, however, it is very difficult to achieve perfect dryness; anhydrous compounds gradually [[Absorption (chemistry)|absorb]] water from the [[atmosphere]] so they must be stored carefully.