What is the impact of height, let's say being on top of a 4,000 m high mountain, on blood pressure / flow velocity given Bernoulli's Equation?
closed as unclear what you're asking by John Rennie, alephzero, sammy gerbil, ZeroTheHero, Jon Custer Sep 27 '18 at 17:38
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Bernoulli's Equation cannot be applied in this case, because it relies on the assumption of steady flow. Flow of blood through a human circulatory system is not steady, because the pressure varies during the cycle of the heartbeat.
Also, because of the steady assumption, Bernoulli cannot be used to relate the state of a fluid system at two different points in time (i.e. before and after the ascent of a mountain). If the system has changed between those two different times, then by definition the flow cannot be steady, so again Bernoulli can't be used.
I think you are referring the to gz term in the Bernoulli equation. You are wondering what effect this term has if the datum for z is at (say) sea level, and the flow system (in this case, a person's blood system) is located at 4000 ft. Well, it is important to notice that there are two gz terms in the Bernoulli equation, namely $gz_1$ and $gz_2$. It is the difference between these two terms that is related to the pressure variation in the flow system, not just either one of them. In other words, it is differences in elevation that are important in the Bernoulli equation, not the absolute magnitude of any one elevation.