Translation guide
This concept refers to creating an airtight or completely sealed closure, often used in technical, scientific, or culinary contexts. The most common Japanese expressions are compound verbs or nouns involving 密封 (mippū).
To close a container or space so that no air or gas can enter or escape.
The standard verb meaning 'to seal hermetically' or 'to seal airtight'. Used for containers, packages, and technical applications.
食品を密封して保存する。
Seal food hermetically and store it.
This container is completely hermetically sealed.
Similar to 密封, but often emphasizes closing tightly to prevent leakage of liquids or gases. Common in engineering and packaging.
バルブを密閉してガス漏れを防ぐ。
Seal the valve hermetically to prevent gas leaks.
Literally 'make airtight'. Used in technical contexts, such as construction or engineering, to describe making a space or joint airtight.
窓枠を気密にして断熱性を高める。
Make the window frame airtight to improve insulation.
To seal a container in a way that prevents spoilage or contamination, often by vacuum or heat sealing.
Specifically refers to vacuum sealing, a common method of hermetically sealing food for preservation.
肉を真空パックして冷凍する。
Vacuum-seal the meat and freeze it.
Means 'to hermetically package'. Used in food and pharmaceutical industries.
薬品は密封包装されています。
The chemicals are hermetically packaged.
To close off a connection or opening so that no fluid or gas can pass through.
Technical term for sealing, often used in electronics, semiconductors, or mechanical parts to mean hermetic or protective sealing.
コネクタを封止して湿気を防ぐ。
Seal the connector hermetically to prevent moisture.
Loanword from English 'seal', used broadly for sealing with gaskets, tape, or sealant. Can imply hermetic sealing in context.
配管の継ぎ目をシールする。
Seal the pipe joint hermetically.
Both mean 'seal tightly', but 密封 is more common for everyday airtight sealing (containers, food), while 密閉 is often used for preventing leakage of liquids or gases in mechanical contexts. They are interchangeable in many cases.
瓶を密封する / 密閉する
seal a bottle hermetically
English 'seal hermetically' implies a perfect airtight seal. In Japanese, simply saying しっかり閉める (close tightly) does not convey the same meaning. Use 密封 or 密閉 for hermetic sealing.