Total pressure

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

p_0 = p + q + \rho 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\,