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Pressure is defined as the physical force exerted on an object. The force applied is perpendicular to the surface of objects per unit area. The basic formula for pressure is F/A (Force per unit area). Unit of pressure is Pascals (Pa). Types of Pressures are Absolute, Atmospheric, Differential, and Gauge Pressure. While sipping beverages from a straw, have you noticed that you actually suck the air out of the straw? While you sip the beverage, you’re actually applying 'Pressure'. Pressure (P) = Thrust/ Area
The SI unit is ‘pascals (Pa)’. 1 Pa = 1N/m2
Example: It is easier to hammer a sharp pin than to hammer a blunt pin. This is because the area at the end of the sharp pin is smaller than the area at the end of a blunt pin. This leads to an increase in pressure leading to hammer the sharp pin easily.
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Physics > Force and Pressure > What is Pressure? Definition, Formula, Unit, Examples
Force and Pressure
What is Pressure? Definition, Formula, Unit, Examples
Pressure is defined as the physical force exerted on an object. The force applied is perpendicular to the surface of objects per unit area. The basic formula for pressure is F/A (Force per unit area). Unit of pressure is Pascals (Pa). Types of Pressures are Absolute, Atmospheric, Differential, and Gauge Pressure. While sipping beverages from a straw, have you noticed that you actually suck the air out of the straw? While you sip the beverage, you’re actually applying ‘Pressure’. But, what does it mean? Let’s study more about it.
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What is Pressure?
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).
Formula and Unit of Pressure
Pressure (P) = Thrust/ Area
The SI unit is ‘pascals (Pa)’. 1 Pa = 1N/m2
Example: It is easier to hammer a sharp pin than to hammer a blunt pin. This is because the area at the end of the sharp pin is smaller than the area at the end of a blunt pin. This leads to an increase in pressure leading to hammer the sharp pin easily.
Types of Pressure
Atmospheric Pressure
Absolute Pressure
Differential Pressure
Gauge Pressure
The pressure exerted on a surface by an object increases as the weight of the object increases or the surface area of contact decreases. Alternatively the pressure exerted decreases as the weight of the object decreases or the surface area of contact increases.
A very broad question that can be interpreted in a plethora of ways unfortunately. I will consider it as air pressure on a specific area.
Air pressure is not a function of area. It is the same on all parts of an area that are at the same altitude. If there is a rise in altitude over the considered area there will be a change in air pressure - lowering - as the altitude increases.
If you would like to see that in action, stand at the bottom of a 4 floor flight of stars with an aneroid barometer and read the pressure. Climb to the top of the stairs and read the pressure again. That will show the decrease in air pressure for that particular change in altitude on that particular day.