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1. a device that joins two parts and prevents leakage.
An oil seal reduces the clearance between the rotating and static members.
Static seal a seal which is part of a non-moving component.
Static seals, gaskets and packing are used in many locations.
2. a way in which a liquid or a gas may be prevented from escaping.
Static seals, gaskets and packing effect a seal by being squeezed between two surfaces.
seal – verb
to join two parts in such a way as to prevent leakage.
In pressurised aircraft, bulkheads are provided at the front and rear ends of the fuselage to seal off the crew compartment and the passenger cabin.