The liquid mercury wets the glass and thus provides for a vacuum tight seal.

To achieve a vacuum seal, a gasket is required.

"Well, you'd have to open the vacuum seal, and then all hell would break loose as the air rushed in."

It was a small hole, hardly deep enough to break the suit's vacuum seal.

To the Editor: The best way to open jars is to break the vacuum seal.

A further attempt on Thursday again made contact but failed to create a vacuum seal required to dock.

Put the vacuum seal in place in the entry passage.

The vacuum seal looked secure and was checked every hour on the hour by the technician.

If you don't get a vacuum seal, refrigerate the jam.