Binoculars glossary Argon

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Binoculars in the higher segment are made completely airtight after they have been filled with dry, dust-free nitrogen. This is known as purging. Purging ensures that the binoculars remain completely free of moisture and dust when being used. The nitrogen is fed into the upper segment of the binoculars and a slight over pressure occurs. Argon can also be used instead of nitrogen to purge binoculars. The advantage of using argon is that it does not absorb or react chemically with water.

See Nitrogen

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