Pressure force

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<div class="definition"><div class="short_definition">(<br/>''Or'' pressure-gradient force.) The force due to differences of [[pressure]] within a fluid  mass.</div><br/> <div class="paragraph">The ([[vector]]) force per unit volume is equal to the [[pressure gradient]], &minus;'''&nabla;'''''p'', and the force per  unit mass ([[specific]] force) is equal to the product of the volume force and the [[specific volume]],  &minus;&#x003b1;'''&nabla;'''''p''. In the [[atmosphere]], the vertical component of this force is of the order of 10<sup>4</sup> times the  horizontal component; in meteorological literature the term &ldquo;pressure force&rdquo; usually refers only to  the latter [[horizontal pressure force]].</div><br/> </div>
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<div class="definition"><div class="short_definition">(''Or'' pressure-gradient force.) The force due to differences of [[pressure]] within a fluid  mass.</div><br/> <div class="paragraph">The ([[vector]]) force per unit volume is equal to the [[pressure gradient]], -'''&nabla;'''''p'', and the force per  unit mass ([[specific]] force) is equal to the product of the volume force and the [[specific volume]],  -&#x003b1;'''&nabla;'''''p''. In the [[atmosphere]], the vertical component of this force is of the order of 10<sup>4</sup> times the  horizontal component; in meteorological literature the term "pressure force" usually refers only to  the latter [[horizontal pressure force]].</div><br/> </div>
 
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Latest revision as of 17:54, 20 February 2012


[edit] pressure force

(Or pressure-gradient force.) The force due to differences of pressure within a fluid mass.

The (vector) force per unit volume is equal to the pressure gradient, -p, and the force per unit mass (specific force) is equal to the product of the volume force and the specific volume, -αp. In the atmosphere, the vertical component of this force is of the order of 104 times the horizontal component; in meteorological literature the term "pressure force" usually refers only to the latter horizontal pressure force.

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