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External sealing can refer to different processes or techniques depending on the context in which it is used. Here are a few common meanings of external sealing:

1. Building and Construction:

In construction, external sealing typically refers to the process of sealing the exterior of a building to protect it from external elements such as water, air, and pollutants. This can involve sealing joints, cracks, and gaps in the building’s structure to prevent water infiltration and improve energy efficiency.

2. Industrial and Mechanical Applications:

In industrial and mechanical contexts, external sealing often refers to the use of seals or gaskets on the outside of a mechanical component or system. These seals prevent the entry of contaminants and ensure that the internal components are protected and operate efficiently.

3. Packaging and Transportation:

External sealing can also be important in packaging to ensure that products are properly sealed from the external environment. This is crucial for products that are sensitive to moisture, air, or other environmental factors. Proper external sealing prevents spoilage or damage during transportation and storage.

4. Hydraulic and Pneumatic Systems:

External sealing is vital in hydraulic and pneumatic systems where seals are used to prevent leakage of fluids or gases to the external environment. These seals ensure that the system functions properly without losing pressure or fluid.

5. Medical and Biological Applications:

In medical devices and biological research, external sealing might refer to techniques or materials used to seal external wounds or to create a sterile barrier for various applications.

6. Data Security:

In the context of data security, external sealing can refer to securing a system from external threats, such as hacking attempts or malware attacks, by implementing robust security measures and protocols.

The specific method or material used for external sealing depends on the application and the environmental conditions the sealed object or system will be exposed to. Different materials like silicone, rubber, or specialized polymers might be used for sealing purposes. Additionally, techniques such as caulking, welding, or using adhesives might be employed based on the requirements of the specific application.