Fluid refers to gases, liquids or anything
that flows. When we say pressure in fluid, we are referring to the kind of
pressure which fluids exert. So, what is pressure?
Pressure
Pressure
is a force or vertical force per unit area acting on a surface.
It has the following units
I.
Newton per square metre (Nm-2)
II.
Pascal (Pa)
III.
Bar
1 Bar = 105 Nm-2 = 105Pa
Pressure is a scalar quantity which means it has
size or magnitude with no direction. Mathematically, pressure can be expressed
as
P =
F/A
Where
P= pressure
F= force
A = area
Example Question
Calculate the pressure exerted on the ground by
a body of mass 90kg on an area 450m2
(g = 10ms-2)
Solution
P= F/A
Force = mx g
=
90x 10 = 900N
Area = 450m2
Pressure
= 900/450
= 2Nm-2
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