The glove boxes are kept at a slight vacuum, so any leaks draw air in rather than allow plutonium particles out.

A slight vacuum is placed on the sphere to better ensure a seal.

Leaving the air pump running for another thirty seconds to create a slight vacuum, he removed the pump and capped the end off.

Working in tandem the Draught plant ensured the boiler was always under a slight vacuum.

This can create a slight vacuum that draws air indoors through the chimney.

He heard the diesels firing, waited an instant for the slight vacuum to clear the stale air.

But the slight vacuum fills again with a quick downward blast, which makes the tents boom and stretch their frames.

The plant may operate at either a low pressure or slight vacuum, according to design.

On the way down, the volume of air in the middle ear shrinks, and a slight vacuum is produced.

With a private grin, he kept his tongue wet and his lips tight, creating a slight vacuum for the other man to work against.