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FLUID MECHANICS

1.3.3 Pressure at the same and different depth

Example 1

A diver is working at a depth of 20 m below the surface of the sea. How much
greater is the pressure intensity at this depth than at the surface? Take into

3
consideration specific weight of water is 10000 N/m .

Solution :

3
Putting = 10000 N/m and h = 20 m

gh@
Therefore, p =  
h
p = 10000 x 20

2
= 200000 N/m

= 200 kN / m 2

Example 2

2
Find the height of a water column which is equivalent to the pressure of 20kN/m .(
2
3
Take into consideration specific weight of water,  water = 1000 kg/m x 9.81 m/s )
Solution : Taking the formula p = h

2
2
3
Putting p = 20kN/m and ωwater = 1000 kg/m x 9.81 m/s
Therefore,

20000
h =
9810

h = 04.2 m

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