Pressure in the fluid

       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