define pressure how is it calculated
Answers
Explanation:
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).
Explanation:
Pressure is defined to be the amount of force exerted per area. So to create a large amount ofpressure, you can either exert a large force or exert a force over a small area (or do both).
Pressure Formula
Simply the pressure formula is
P = F / A
Derivation
P = Pressure in Pascal
F = Force on the object
A = Area on which the force act
Besides, we often calculate pressure for gases and fluids. In those conditions, the pressure of liquid or gas is equal to the density of that fluid multiplied by the acceleration due to the gravity and the height (depth) of the fluid above a certain point.
Pressure = density of fluid × acceleration due to gravity × height of the fluid column
P = ρ ×g × h
Derivation of the Pressure Equation
P = Pressure of the object (Pa)
ρ = is the density of the gas or fluid (kg/m3m3)
g = is the acceleration of the object due to gravity (9.80 m/s2s2)
h = is the height of the column of gas or fluid (m)
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Pressure Formula
The pressure is something that we apply to many objects in our daily life. For example, for opening tight jars and seal pack object we apply pressure on them to open them. In this topic, we are going to discuss pressure, pressure formula and solved examples.
SolveQuestions
An air tight container having a lid with negligible mass and an area of 8cm22is partially evacuated. If a 48N force is required to pull the lid off the container and the atmospheric pressure is 1.0 x 1055Pa, the pressure in the container before it is opened must be:
1 Verified answer
Calculate the pressure in pascal exerted by a force of300N300Nacting normally on an area of30cm230cm2
1 Verified answer
How much pressure will an elephant of 4000 kg with foot area of each250cm2250cm2exert?
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Pressure
Pressure on walls of the container
We can define pressure as the physical force that we exert on an object. Also, the force applied to the object is perpendicular to the surface of the object per unit area. Moreover, the unit of pressure in Pascals (Pa).
Besides, there are different types of pressures such as atmospheric, absolute, gauge, and differential pressure. Moreover, when you sip out the beverage from a straw, you firstly suck out the air from the straw? Also, when you sip the beverage you actually apply ‘pressure’.
Meaning of Pressure
For understanding pressure in a more clear sense let’s discuss a situation. Suppose you take a bowling pin and try to hammer it into a wall. In doing so you find out that nothing will happen to the bowling pin but it can damage your wall.
But, if in place of the bowling pin you use a nail and try to hammer it with same force then the nail would likely to penetrate the wall. By this example, we came to know that just knowing the magnitude of the force is not enough you also need to know how that force will distribute on the surface of impact.
Moreover, for the nail the all the force amidst the wall and the nail was centered into the small area on the sharp tip of the nail. On the other hand, for the bowling pin, the area touching the wall was much larger in comparison to the nail and as a result, the force was less concentrated.
Pressure Formula
Simply the pressure formula is
P = F / A
Derivation
P = Pressure in Pascal
F = Force on the object
A = Area on which the force act
Besides, we often calculate pressure for gases and fluids. In those conditions, the pressure of liquid or gas is equal to the density of that fluid multiplied by the acceleration due to the gravity and the height (depth) of the fluid above a certain point.
Pressure = density of fluid × acceleration due to gravity × height of the fluid column
P = ρ ×g
Pressure - Advanced
Derivation of the Pressure Equation
P = Pressure of the object (Pa)
ρ = is the density of the gas or fluid (kg/m3m3)
g = is the acceleration of the object due to gravity (9.80 m/s2s2)
h = is the height of the column of gas or fluid (m)
Solved Examples on Pressure Formula
Example 1
If the wreckage of the ship that sunk in the ocean is 3,800 m under the ocean water. Also, the density of cold saltwater above it is 1,050 Kg/m3m3. Then calculate the pressure at that depth?
Solution:
By using the pressure formula we can find the pressure on the sunk ship.
Now let’s apply pressure formula which is
P = ρ ×g × h
P = (1,050 kg/m3m3) (9.80m/s2s2) (3800 m)
P = 3,91,02,000 kgm⋅s2kgm⋅s2
Or P = 3,91,02,000 Pa
For more simpler form we can convert it into Mega-Pascal that is 39.1 MPa.
Moreover, the pressure of the ocean water at the depth of the sunk ship is 3,91,02,000 Pa or 39.1 MPa.