what is pressure? give two examples
Answers
Answer:
Pressure is defined as a measure of the force applied over a unit area. Pressure is often expressed in units of Pascals (Pa), newtons per square meter (N/m2 or kg/m·s2), or pounds per square inch. Other units include the atmosphere (atm), torr, bar, and meters sea water (msw).
In equations, pressure is denoted by the capital letter P or the lowercase letter p.
Pressure is a derived unit, generally expressed according to the units of the equation:
P = F / A
where P is pressure, F is force, and A is area
Pressure is a scalar quantity. meaning it has a magnitude, but not a direction. This may seem confusing since it's usually obvious the force has direction. It may help to consider pressure of a gas in a balloon. There is no obvious direction of the movement of particles in a gas. In fact, they move in all directions such that that the net effect appears random. If a gas is enclosed in a balloon, pressure is detected as some of the molecules collide with the surface of the balloon. No matter where on the surface you measure the pressure, it will be the same.
Usually, pressure is a positive value. However, negative pressure is possible.
or
The amount of force exerted (thrust) on a surface per unit area is defined as ‘Pressure’. It can also be defined as the ratio of the force to the area (over which the force is acting).
examples are
1 Atmospheric Pressure
2 Absolute Pressure
3Differential Pressure
4Gauge Pressure.
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