Suction

Suction is the creation of a partial vacuum, or region of low pressure. The pressure gradient between this region and the ambient pressure will propel matter toward the vacuum.

Related Topics:
Vacuum - Pressure gradient

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Vacuums do not actually attract matter; matter is pushed into them by the higher pressure of surrounding air (there being nothing in a vacuum to do any attracting). At zero air pressure, such as in space, suction would have no effect. However, most humans live at air pressure near 101.325 kPa (14.7 lbf/in²), which is the average atmospheric pressure at sea level. (It is lower at higher elevations.)

Related Topics:
KPa - Sea level

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