Pressure

Pressure

Pressure is defined as perpendicular force acting on a surface per unit area.

 

Formula of Pressure

P = Pressure
F = Force
A = Contact Area

Factors affecting the magnitude of Pressure:

Magnitude of the force:
The larger the force, the higher the pressure.

Contact area:
The larger the contact area, the lower the pressure.

S.I. Unit of Pressure:

The S.I. unit of pressure is:

Pascal

Notes:

1Pa = 1 Nm^-2

Other units:
cmHg, atm

 

Application Involving High Pressure

• Sharp Knife
• Ice-Skate
• Sole with spike

Application Involving Low Pressure

• Foundation of Building
• Snow Shoes
• Tyre of Tractor
• Feet of Elephant