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 P1 = P2....
thanks in advance for all your help!!