negative pressure n.
Pressure that is less than ambient temperature.
On the leeward side the negative pressure is uniform except near the edges, and its value depends on the form of the plate.
During expansion of the chest a negative pressure is established in the air passages and air flows into them from without.
This causes an 'area of discontinuity of flow', or eddy, which results in 'negative pressure', causing an upward suction.
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.
|negative pressure |
See under pressure.