SICCO VacuumGlossaryVacuum The pressure of a gas in a vessel is lower than atmospheric pressure or lower than 300 mbar (the lowest possible atmospheric pressure on earth’s surface). In colloquial language, vacuum describes a free space. Desiccators are suitable for storing sensitive products in a vacuum The vacuum inside the desiccator ensures rapid drying of the stored products. These systems allow storage in an oxygen and carbon dioxide free environment and are, for example, suitable for storage of semiconductor samples.