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Hermetic seal : ウィキペディア英語版 | Hermetic seal
An hermetic seal is the quality of something—a container, structure, etc.—being airtight (excluding passage of air, oxygen, or other gases). Used technically, it is stated in conjunction with a specific test method and conditions of use. ==Etymology == The word ''hermetic'' comes from the Greek god Hermes, via the vocabulary of alchemy. The alchemists invented a process for making an airtight glass tube, which they used for distillation. The process used a secret seal, whose invention was attributed to the legendary inspiration of alchemy, Hermes Trismegistus.
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