Pressure is the force
exerted on a unit area of a surface.
P =F/A
P = is the equation
of pressure. And unite of pressure is Nm-2or
Pascal.
According to Pascal’s
principle “pressure applied on a liquid in a closed container is
transferred equally in all directions throughout the liquid”.
In hydraulic system
the force is transferred from one place to another with the help of a liquid.
A mechanism in which works on the
Pascal’s principle of fluid pressure and transmit force one place to another is
called a Hydraulic system.
Hydraulic press is a machine
which works on the Pascal’s principle.
Hydraulic
breaks also works on the Pascal’s principle.
The study of behavior of gases under
pressure is called pneumatics.
Robert Boyle, a British
scientist, studied the behavior of a gas under pressure.
The atmospheric pressure
around us at the ground level is about 100,000Pa or 100KPa.
Atmospheric pressure decrease
with increase in height from earth’s surface.
Barometer is a device
which is used for the measurement of atmospheric
pressure.
When we increase the temperature
of a gas, then it increase the pressure of the gas movement of the molecules
also increase which result in increase of pressure.
Aerosol is a suspension
of tiny liquid particles dispersed in a gas present in a closed
container.
Atmospheric
pressure is the pressure exerted on the surface of any objects by the
atmospheric gas.
The formula of pressure P =………………….
a) F × A
b) A /F c)F/A d)
F ×
D
When we apply more force to reduce the volume of gas as shown in following picture it: PET----- 24/08/2019
a) increase the pressure inside a container b) reduces the pressure inside a container c) eliminates pressure inside a container d) pressure will be constant
