noun which may take the genitive case particle 'no', noun
airtight; hermetic
Describes a seal or enclosure that prevents air or gas from passing through. Commonly used in technical contexts such as containers, buildings, and packaging.
この容器は気密性が高いので、食品が長持ちします。
This container is highly airtight, so food stays fresh longer.
気密構造の窓は断熱効果も優れている。
Windows with an airtight structure also have excellent insulation.