gastightness
/ˈɡæsˌtaɪtnəs/
noun
- The quality or state of being sealed so that gas cannot pass through.
- The gastightness of the container was tested by filling it with helium and checking for leaks.
- Engineers must ensure the gastightness of the fuel tank to prevent dangerous fumes from escaping.
- The laboratory's success depended on the gastightness of its vacuum chambers.