Answer :

Nitrogen Purging is the evacuation method that involves charging a system with nitrogen to absorb moisture. It is used extensively in industrial processes where it is crucial to remove moisture and contaminants.

The evacuation method that involves charging a system with nitrogen to absorb moisture is known as Nitrogen Purging. This method is often used in refrigeration, air conditioning systems, and processing of certain food items where it is necessary to remove moisture, contaminants, and oxygen. In this process, nitrogen, a dry, inert gas, is introduced into the system at a pressure slightly higher than atmospheric pressure. As the nitrogen flows through the system, it absorbs the moisture and sweeps it out, leaving the system dry and free of contaminants.

For instance, when preparing samples for Scanning Electron Microscopy (SEM), it's crucial that the specimens are thoroughly dehydrated. In such cases, Nitrogen Purging can be employed to ensure the specimen is devoid of any moisture.

In essence, Nitrogen Purging serves as an effective method for system evacuation, widely utilized in several industrial processes due to its ability to absorb and remove moisture efficiently.

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