To determine the pressure difference between point A and B, start from one end and work to the other end:
pA - ρ1gh1 - ρ2gh2 + ρ1g (h1 + h2) = pB
Rearrange terms to yield:
pA - pB = gh2 (ρ2 - ρ1)
For the given values of ρ1 = 1000 kg/m3, ρ2 = 1600 kg/m3 and
h2 = 0.75 m:
pA - pB = (9.8 m/s2) (0.75 m) (1600 - 1000)
= 4.4 kPa
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