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O lvl Phy: Pressure

The apparatus shown in the diagram below is used to measure the density of oil The density of water is 1000 kg m-3 and the atmospheric pressure is 100 000 N m-3.


(a) Calculate the pressure at the liquid surface A inside the tube in N m-2.
(b) Hence, find the pressure at the liquid surface C inside the tube.
(c) Determine the density of oil
[Take g = 10 N/kg where necessary]

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Answer:


(a) Pressure at A = 100 000 + 0.08 Χ 1000 Χ 10 (atm + ρgh)
= 100 800 N m-2

(b) *Star Question*

Pressure at C = Pressure at A (air pressure evens itself throughout in an enclosed space)

= 100 800N m-2


(c)

Atm pressure + pressure due to oil column = 100 800

Pressure due to oil column = 800

0.12 Χ density of oil Χ 10 (ρgh) = 800

Density of oil = 667 kg / m-3




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