Question about formulas in fluids

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SUMMARY

The discussion centers on the application of Bernoulli's equation and momentum principles in fluid dynamics, specifically regarding the treatment of gauge pressure versus atmospheric pressure. It is established that atmospheric pressure is typically omitted in calculations because it cancels out when both pressures are atmospheric. However, when one pressure is atmospheric and the other is not, the atmospheric pressure is still disregarded, leading to confusion. The consensus is that this omission simplifies calculations without affecting the outcome, as long as the same reference point is used consistently.

PREREQUISITES
  • Understanding of Bernoulli's equation
  • Familiarity with fluid dynamics principles
  • Knowledge of gauge pressure versus absolute pressure
  • Basic grasp of momentum conservation in fluids
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  • Study the derivation and applications of Bernoulli's equation in fluid mechanics
  • Explore the differences between gauge pressure and absolute pressure in various contexts
  • Research momentum conservation principles in fluid systems
  • Examine case studies where atmospheric pressure is omitted in fluid calculations
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MMCS
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When using bernoullis and momentum, gauge pressure is only used in calculations, any atmospheric pressure is generally omitted, i could understand if, for example, using bernoullis, pressure 1 and pressure 2 were both atmospheric, therefore they would cancel out, but when one pressure is atmospheric and another if different it is still omitted. Why is this?
 
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Because atmospheric pressure can still be subtracted out on both sides of the equation.
But you can't have it on one siode and not the other.
 

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