Fluid Mechanics and Machinery

Pressure-Absolute, Gauge, Atmospheric and Vacuum Pressure

Are you looking for the Pressure and Different types of Pressure? So today we will study the Pressure and there different types (which includes Absolute, Gauge, Atmospheric, and Vacuum Pressure). Here you will get the articles of Mechanical Engineering in brief with some key points and you will get to know an enormous amount of knowledge from It. So If you find this articles helpful, please let us know in the comment box, either if any correction required too, also let us know in the comment box.

Let’s know the definition of Pressure,

Pressure (p)  is defined as force per unit area applied in a direction perpendicular to the surface of an object.

Pressure is an effect which occurs when a force is applied on a surface.

Pressure is the amount of force acting on a unit area. This is a compressive stress on the fluid and the mathematical expression is,

Pressure (p) = Force / Area = F / A

Where p is the pressure and the SI unit is Pascal. (1 Pa = 1 N/m2).

F is the normal force and the SI unit is Newton (N).

A is the area. The SI unit is m2.

Do you know the pressure also expressed in the terms of Bar?. Let’s know in brief the unit conversion,

1 Pa = 1 N/m2

1 kPa = 1000 N/m2

1 bar = 100 kPa = 105 N/m2.

Different types of Pressure:

We will understand the relation between the Absolute, Gauge, Atmospheric and Vacuum Pressure by a line diagram.

Absolute pressure

The pressure on a fluid is measured in two different systems. In one system, It is measured above the absolute zero or complete vacuum and it is called the absolute pressure. And the other system, the pressure is measured above the atmospheric pressure and It is called gauge pressure. Therefore,

The Absolute pressure is defined as the pressure, which is measured with reference to absolute vacuum pressure.

Gauge pressure is defined as the pressure, which is measured with the help of a pressure measuring instrument, in which, the atmospheric pressure is taken as a datum. The atmospheric pressure on the scale is marked as zero.

Mathematically,

Absolute Pressure = Atmospheric Pressure + Gauge Pressure

Vacuum Pressure  = Atmospheric Pressure – Gauge Pressure

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