Define the pressure of a fluid at rest increases with depth (as a result of added weight).

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Define the pressure of a fluid at rest increases with depth (as a result of added weight).

Expert Solution
Step 1

Given Data:

  • The density of the liquid is ρ.
  • The depth at which the pressure is to be defined is h.
  • The Pressure at the depth h is P.
  • The atmospheric pressure is Patm.

To find the pressure at the depth of the h from the surface of the liquid draw an elementary fluid element of area of cross section dA as shown,

Mechanical Engineering homework question answer, step 1, image 1

 

Step 2

The Free body diagram (FBD) of the body can be drawn as,

Mechanical Engineering homework question answer, step 2, image 1

The elementary fluid element is acted upon by the three forces,

  • W is the weight of the fluid element acting downwards
  • The force due to atmospheric pressure Patm which acting on the cross section
  • The force due to pressure P at the bottom area

The weight of the elementary fluid element can be calculated as,

Mechanical Engineering homework question answer, step 2, image 2

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