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==Introduction==
 
==Introduction==
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Pressure is force per unit area.  Therefore its si unit the Pascal is N/m<sup>2</sup>.  However it is common in physiology to use mmHg which is the measure of pressure at the bottom of a column of mercury of that height.
 
Pressure is force per unit area.  Therefore its si unit the Pascal is N/m<sup>2</sup>.  However it is common in physiology to use mmHg which is the measure of pressure at the bottom of a column of mercury of that height.
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[[Category:Transport Across Membranes]]
 
[[Category:Transport Across Membranes]]