Hermetic closure
In laboratory and chemical technology , physics and apparatus engineering , a hermetic seal is an absolutely tight seal, in particular preventing the exchange of air or water .
As Hermetic sealing is known to prevent a mass transfer the process of sealing. The term is historically derived from Hermes Trismegistos (see Hermetic ).
With a hermetic seal, for example, equipment can be made watertight to dry chemicals. Similarly, a vacuum can be maintained with a suitable closure . Other examples of hermetically sealed systems are heat pumps and chillers . In order to avoid the slightest contamination of the medium by air or water, which impair the function, or to avoid leakage of the medium (e.g. environmentally harmful), such systems must be absolutely impervious to the exchange of material.