What is the process that retains liquids and gases within a given area by closing all structural passages?

The process that effectively retains liquids and gases within a designated area by closing all structural passages is known as sealing. This involves using materials or methods to ensure that there are no leaks or gaps through which fluids or gases could escape. Sealing is crucial in aerospace applications to maintain system integrity, prevent contamination, and ensure safety, as even minor leaks can lead to significant problems in flight operations.

Sealing mechanisms can include gaskets, O-rings, sealants, and other products specifically designed to create airtight or watertight barriers. An effective seal not only contributes to the overall performance of the aircraft systems but is also essential for adhering to strict regulatory standards concerning safety and reliability.

In contrast, insulation refers to materials or techniques used to prevent heat transfer, ventilation involves air movement and exchange to manage temperature and air quality, and containment generally refers to measures taken to enclose substances temporarily to prevent spills or leaks, though it does not specifically address the sealing of structural passages. Each of these processes plays a different role in aerospace applications, highlighting the importance of understanding the specific function and context of sealing.