Vacuum

The Wards are open-topped, with skyscrapers rising from the superstructure. Towers are sealed against vacuum, as the breathable atmosphere envelope is only maintained to a height of about seven meters. The atmosphere is contained by the centrifugal force of rotation and a "membrane" of dense, colorless sulphur hexafluoride gas, held in place by carefully managed mass effect fields.

a vacuum of 26 inches of mercury, or 13 pounds per square inch

Henrietta soon found a terrible vacuum left, by the letters in which she used to pour forth every feeling and thought to her uncle.

Abs show up in a most-muscular shot, a vacuum shot, the hands-behind-head compulsory ab shot, twisting poses, and so on.

Right I'm off to practice my vacuum - suck in those stomachs now!

When I do the 'gut vacuum' exercise the abdominal wall seems to return to normal size, as far as I can tell under the flab.

Blessed with round muscle bellies and a phenomenal structure, he also performed a vacuum pose on stage.

“Who in the world cleans an attic? That's like vacuuming a shed.”

But the advantage of an auto-vacuumed database is that when B-tree pages are no longer needed, they are moved to the end of the database file and then the database file is truncated, thus returning the unused pages back to the filesystem.