Light scattering by particles: Difference between revisions

Revision as of 22:46, 19 June 2013

In physics, the term total pressure may indicate two different quantities, both having the dimensions of a pressure:

In fluid dynamics, total pressure ( $p_{0}$ ) refers to the sum of static pressure p, dynamic pressure q, and gravitational head, as expressed by Bernoulli's principle:

p_{0} = p + q + ρ g z

where ρ is the density of the fluid, g is the local acceleration due to gravity, and z is the height above a datum.

If the variation in height above the datum is zero, or so small it can be ignored, the above equation reduces to the following simplified form:

p_{0} = p + q

In a mixture of ideal gases, total pressure refers to the sum of each gas' partial pressure.

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+In [[physics]], the term '''total pressure''' may indicate two different quantities, both having the dimensions of a [[pressure]]:
+* In [[fluid dynamics]], ''total pressure'' (<math>p_0</math>) refers to the sum of [[static pressure]] p, [[dynamic pressure]] q, and gravitational head, as expressed by [[Bernoulli's_principle#Incompressible_flow_equation|Bernoulli's principle]]:
+:<math>p_0 = p + q + \rho g z\,</math>
+:where ρ is the density of the fluid, g is the local acceleration due to gravity, and z is the height above a datum.
+:If the variation in height above the datum is zero, or so small it can be ignored, the above equation reduces to the following simplified form:
+:<math>p_0 = p + q\,</math>
+* In a mixture of [[ideal gas]]es, ''total pressure'' refers to the sum of each gas' [[partial pressure]].
+[[Category:Pressure]]
+[[Category:Fluid dynamics]]
+[[Category:Gases]]