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Gasses or liquids that move along a pressure gradient can exert forces on objects. Objects can only be pushed by gases or liquids. The correct terminology used depends on whether they are pushed from a pressurized zone towards ambient pressure (blown out) or from ambient pressure towards a low
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decreases the pressure inside, creating an imbalance with the ambient air pressure, resulting in suction. Similarly, when a straw is used to suck a liquid into the mouth, the atmospheric pressure pushes the liquid through the straw along the pressure gradient.
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gradient. Contrary to popular belief, however, the forces acting in this case do not originate from the lower pressure side (the vacuum), but from the side of the higher pressure.
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A common semantic mistake is made when in case of accidents with spaceships or aircraft in which objects are blown out of the vessel in the case of an
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and muscles around the rib cage cause a change of volume in the lungs. The increased volume of the
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is the day-to-day term for forces experienced by objects that are exposed to the movement of
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pressure zone (sucked in). Gases and liquids cannot generate pulling forces on objects.
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which is often wrongly referred to as objects being sucked out.
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relative to the region of lowered pressure, referred to as
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when air flow results in a reduced pressure region.
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