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Hermetic

usgb/hɜːrˈmetɪk/Volume
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Absolute SealPlay
The term emphasizes an absolute seal, without any leaks. SlideThe laboratory containers were hermetic to prevent contamination.
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Preservation QualityPlay
Hermetic sealing is key for long-term storage of food or materials. SlideFood companies use hermetic packaging to extend shelf life.
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Technical ContextPlay
It is often used in technical contexts like engineering or science. SlideThe spacecraft's compartments must be hermetic to protect the crew.