pressure and its applications

2. PRESSURE
01
02
03
INTRODUCTION
a)Atmospheric pressure
b)b) Fluid pressure
APPLICATION OF PRESSURE
REVISE AND EXPERIMENT

4. Effect of force on a given area is called pressure.
Pressure depends on two factors. They are: force
applied and area over which force acts.
The formula of pressure is:
Pressure=Force/Area.
01. INTRODUCTION

5. Pressure can also be defined in terms of another force
called thrust.
The force acting on a body perpendicular to its
surface is called thrust.
So, we can also define pressure as thrust per unit area
is Pressure=Thrust/Area.
The SI unit of pressure is Pascal (Pa).

6. “The same force produces less
pressure if it acts on a large area
but can produce less pressure if
it acts on a small area.”
REMEMBER:

7. Like all gases, air also have weight hence exerts
pressure.
The force exerted by the atmosphere on unit area is
called atmospheric pressure.
Air exerts huge pressure in every direction.
( show video about air pressure )
a) Atmospheric pressure

9. Unlike solids, the liquids do not have a definite
shape. They take the shape of the containing vessels.
The pressure in liquids is not thrust per unit area.
instead it depends it depends upon the depth and
density of the liquid.
Fluids have weight so they exert pressure on the
base and walls of the container.
b) Fluid pressure

10. The pressure at a depth in a liquid depends on two factors:
o The height of the liquid column.
o The density of the liquid.

11. a. The edge of the knife is made sharper increase pressure.
02. APPLICATION

12. b. In vacuum cleaner a low pressure is created inside with
the help of a fan and this low pressure helps in the working
of vacuum cleaner

13. c. The straw helps us to drink juice because the
atmospheric pressure is exerted on the surface of the
juice.

14. The effect of force on a given area is called pressure.
The SI unit of pressure is Pascal(Pa) equal to 1 Newton per
meter square the pressure exerted by air is called atmospheric
pressure.
Atmospheric pressure is the force exerted by the atmosphere on
unit area
A liquid exerts pressure in all direction.
At the same depth the pressure is same in all direction.
Liquid pressure increases with depth
03. REVISION