## Pressure

- It is the normal force acting on a per unit area of the surface.
- The S.I. unit of force is Pascal or N/m^2.
- It is denoted by'p'.

**Pressure = Thrust/Area**

and by this formula, we can get the following formulae:

- Thrust = Pressure*Area
- Area = Thrust/Pressure

### Do You Know

- 1 N/m^2 = 1 Pascal
- 1 bar =10^5 Pascal
- 1 atm =1.013*10^5 Pascal
- 1 torr = 133.33 Pascal

### Factors Affecting Pressure

- Pressure is directly proportional to the normal force acting. On increasing the force, the pressure increases.
- Pressure is inversely Proportional to the surface area. On increasing,the surface area, the pressure decreases.

### Applications

- Broad handles are provided in suitcase and bags.
- Cutting edges of knife are sharp.
- Camel is known as the ship of the desert
- Nails and pins have pointed ends.

### Do You Know

- Fluids also exert pressure.
- The gasses exert pressure on the walls of the containers.
- The pressure in the liquid increases with depth.

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