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## Homework Statement

so i just had some questions:

1. is there a difference between h and d?

sometimes i see P = [tex]\rho[/tex]gh and other times P = [tex]\rho[/tex]gd

is there a difference? because if d=depth while h=height, would d always be a neg number?

2. for hydrostatic pressure, i was taught: P = Patm + [tex]\rho[/tex]gd, but i notice when I look at other's questions they will leave out the atmospheric pressure. Is there a difference? why do they leave it out?

3. Is there some kind of "steps" i can follow when assessing a pressure/fluid problem to decide what method to use to solve it?

for example, if it is a U-tube problem, look to use the concept that at the same level pressure is equal in the two arms so P

_{1}= P

_{2}....

thanks in advance for all your help!!