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The functions of vacuum bottles

Preservation of substances: Vacuum bottles prevent air from entering, which helps to preserve the quality and freshness of the contents. For example, it can keep food from spoiling and extend the shelf life of perishable items. 

Prevention of oxidation: By eliminating the presence of oxygen, vacuum bottles can prevent oxidation of substances such as cosmetics or chemicals. This helps maintain their efficacy and stability.

Temperature insulation: Some vacuum bottles have the ability to insulate temperature, keeping hot substances hot and cold substances cold for an extended period.