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The thing that is low pressure is air.

When a meteorologist says that there is an area of "Low Pressure" he is saying that there is a low air pressure in an area or, more exactly, that there is less air per cubic unit than there is in surrounding areas.

So, if neutrally pressured air met with low pressured air the neutrally pressured or comparatively condensed air, a.k.a "high pressure" air would fall downward until it reached a state of equilibrium. And attaining equilibrium by both mixing with the surrounding air and falling to an altitude of similar air pressure.

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