# Fluid mechanics, Hydraulics

Piston A has a cross section of 1200 sq.cm. While that of piston B is 950 sq.cm. with the latter higher than piston A by 1.75m. If the intervening passages are filled with oil whose specific gravity is 0.80, what is the difference in pressure between A and B

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1. The area does not determine the pressure but only the force when the pressure is known.
All that matters here is the difference in altitude.
B is high
A is low
density * g * 1.75 meters
.8 * 1000 kg/meter^2 * 9.81 * 1.75

= 13,734 Newtons/m^2 or Pascals
one atmosphere is about 100,000 Pascals
so we are talking about 0.13 atmospheres

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