negative pressure

The well had passed positive pressure tests, but there is evidence that it may not have passed crucial negative pressure tests.

On the leeward side the negative pressure is uniform except near the edges, and its value depends on the form of the plate.

Open valve B and the negative pressure draws on the affected part.

If the wound in a vein is thus held open, the negative pressure during inspiration sucks air into the right side of the heart.

The passage of the fluid is readily effected by negative pressure produced by an ordinary water exhaust-pump.

During expansion of the chest a negative pressure is established in the air passages and air flows into them from without.