密閉

1. Origins, structure, and basic meaning

• Structure: In 密閉 (みっぺい), tight 密 and closed 閉 combine to denote airtight sealing.
• Basic usage: 密閉した presents the act of tightly sealing a container or space, while 密閉された describes what has been sealed.

2. Common pitfalls and similar expressions

• Sealing action and sealed state
  • It implies blocking passage of air or liquid more strongly than merely placing a lid on something.