What is the formula for pressure?
27 Answers | Add Yours
Pressure is defined as the normal force per unit area of a surface. If F is the force acting normal to the surface area A,then the pressure P is given by :
P = F/A, Newtons/square meter or P = F/A Pascals.
According to the dimensional analysis of the pressure from this definition is: Force/Area = [M^1]*[L^1][T^(-2)]/[L^2]
= [M^1][L^(-1)][T^(-2)], where M represents mass, L represents length and T represents time in fundamental standard units.
Pressure (symbol: p) is the force applied per unit area, in the direction perpendicular to that surface.
P=F/A, where, F is the normal force, A is the area.
Pressure is a scalar, which in IS is measured in pascals.
1 Pa = 1 N/m2
The pressure is transmitted to surrounding areas or sections of the field of fluid, in the normal direction at any point in these areas or sections.
It is a fundamental parameter in thermodynamics and is a joint variable to volume.
Static pressure, usually denoted SP, is the inner pressure of a fluid which is measured with a device that moves with the same speed as the fluid. For example, to the walls of a pipeline is carried the static pressure of fluid flowing through it.
Dynamic pressure is the additional pressure of a fluid that would hit an area and would be forced to consume completely it's kinetic energy. It is expressed by the relation:
p dynamic= rho*(v^2/2)
where rho is fluid density in kg/m^3, v is velocity in m / s.
Stagnation pressure is the pressure that would exert a fluid in motion if it were forced to stop. If a fluid moves faster, its stagnation pressure increases. Static pressure and stagnation pressure are related to Mach number of fluid. See also Bernoulli's equation, which however is valid only for incompressible fluids.Pressure of a fluid in motion can be measured with a Pitot tube, connected to a manometer.
Hydrostatic pressure is the pressure due to the weight of a fluid.
ρ (rho) is density of the fluid (eg water density is almost 1000 kg/m3);
g is the acceleration due to gravity (conventional, 9.80665 m/s2 to the sea surface);
h is the height of column of liquid (in meters).
Pressure of explosion or deflagration
Explosion or deflagration pressures are created by igniting explosive gas, aerosol, suspension in closed or open spaces. These pressures propagate as a wave of shock.
While pressures are generally positive, in some cases negative pressures are meet:
-When discussing the relative pressures. For example, an absolute pressure of 80 kPa may be expressed as a relative pressure of -21 kPa (ie 21 kPa under atmospheric pressure of 101 kPa). The technique is called "a depression of 21 kPa.
- When attractive forces (eg Van der Waals forces) between particles of fluid, exceeds the forces of rejection. This scenario, however, is unstable because the particles are closer and closer until rejection forces would balance the forces of attraction.
- Negative pressures occurring during plant transpiration.
-Casimir effect can create small forces of attraction by interacting with vacuum energy. Sometimes this is called 'vacuum pressure' (not to be confused with depression).
- Depending on the reference system to surface orientation, a positive pressure on one side of a surface can be considered negative on the other side of the area.
- In cosmology( dark energy, expansion of the universe).
The formula for pressure is
P = F/A
In this equation, P stands for pressure while F stands for force and A stands for area. Pressure is typically measured in a unit called the Pascal.
So what this means is that the amount of pressure that is exerted on an area is determined by the size of that area and by the amount of force that is pressing against it.
Therefore, if you have a given amount of force, you will have more pressure if it presses down on a small area than if it presses down on a large area.
Pressure is often listed as psi. The formula to measure pressure is Pressure equals force in pounds over the area in square inch. The written abbreviated formula is P= F/A.
By looking at the formula one can see that top obtain the pressure on an object, one must divide the the force by the area of an object.
All fluids, liquids, and gases omit pressure. If a fluid is not moving it exerts even pressure. Air pressure is measured by using a barometer.
Pressure is defined as the normal force per unit area of a surface.
If F is the force acting normal to the surface area A, then pressure P is given by:
The formulae for pressure is P= F/A
Pressure is the amount of force acting perpedicularly per unit area. The symbol of pressure is p.
p is the pressure
F is the normal force
A is the area of the surface on contact.
Pressure is a scalar quantity. It relates the vector surface element (a vector normal to the surface) with the normal force acting on it. The pressure is the scalar proportionality constantthat relates the two normal vectors.
F= normal force
A= area of surface on contact
Pressure = Force/Area
The formula for pressure is P= F/A
The formula of pressure is force divided by area of the surface area on contact. Pressure is the force per unit area applied in a route perpendicular to the surface of an object. It is a scalar quantity denoted by the symbol p.
The formula for pressure is:
P = F/A
where P is pressure, F is force and A is area.
The SI unit for pressure is the Pascal ( Pa ) which stands for: `N/m^2`
`<span style="font-size: 14px;">The standard system uses psi or pounds per square inch. </span>`
`<span style="font-size: 14px;">Torr and mm Hg (read: millimeter Mercury) are also pressure units. </span>`
`<span style="font-size: 14px;">Atm is also a unit of pressure and as you can guess is </span>`equivalent to the pressure of Earth's atmosphere.
To convert between the major units:
1 Atm = 101 kPa = 760 Torr = 760 mm Hg = 14.5 psi
the formula for pressure is pressure = force/area
where P is for pressure, usually measured in Pascals
F is force, how much force you're applying
A is for surface area upon which the pressure is being applied on
The formula states that the pressure exerted on an area is evenly distributed by the amount of force applied onto that area.
The formula for pressure is P=F/A
P = Pressure
F = Force being applied
A = (Surface) area on which the pressure is being applied to.
The formula for pressure is P = F / A
F = Force that is applied
A = Total area of the subject or also known as surface area
P = pressure
Ex:Calculate the pressure produced by a force of 900 N acting on an area of 3.0 m2
"Pressure is defined as force per unit area." The formula for pressure is `P = (F)/(A)`, which stands for `Pressure = (Force)/(Area)`. You could use this formula for many different things, but one example would be the difference in force between an object placed at different angles. There is a photo on the website I linked below.
Pressure = Force / Area
SI system :
- Unit of force - Newton (N)
- Unit of area - m^2
- Unit of pressure - Pa
- 1 Pa = 1 N/m^2
- Unit of force - Dyne
- Unit of area - cm^2
- Unit of pressure - Barye
- 1 Barye = 1 Dyne /cm^2
Basically pressure is directly proportional to force and inversely proportional to area.
I other words more force and less area means more pressure.
This link can guide you. It has even examples in it. Hope it helps. :)
Pressure in solid is equal force divided by its area where s in liquids the pressure is equal to density of the liquid multiplied by its depth multiplied by the gravitational field strength
Hence Pressure =Force (F) / area (A) in solids
and P = density (d) x depth (h) x gravitational field strength (g=10) .
Pressure can be defined as the force applied to in doing something. Like Peeling an apple etc.
The effects of pressure can be seen in everyday situations.
Pressure when applied;
- a small force gives low pressure
- a large force gives high pressure
To calculate pressure we need to measure the size of the force applied and the size of the area to which the force is applied.
Area is usually measured in square meters. where as, force is measured in Newtons (N).
In scientific terms, Pressure is the force per unit area. That can be expressed in a formula;
Pressure = Force/Area
P = F/A
Where, P= Pressure
F = Force
A = Area
The pressure under an elephants feet can be calculated.
Each foot has an area of about 0.2 meter power square.
It has four feet on the ground, so the total area is around 0.8m2.
The elephant weighs 50000 newtons, so this is the force.
Pressure = Force/Area
Pressure = 50000/0.8
Pressure = 62500 N/Meter square...
PRESSURE FORMULA - As Energy Density
For measuring Pressure in a fluid or liquid, it will be taken as energy per unit volume.
Pressure = Energy/Volume
P = W/V
PRESSURE FORMULA - As Kinetic Fluid energy
Pressure = Kinetic energy/ Volume
PRESSURE FORMULA - Fluid potential energy
Pressure = Potential Energy/ Volume
WHAT IS THE PRESSURE UNDER OUR FEET?
To calculate pressure under our feet, we need to know the force and area, the force acts on.
Suppose Joe weighs 500N and is wearing stiletto heels which together have an area of 1 cm square (0.0001 meter square).
The pressure under Jo's bare foot would be;
Pressure = Force/Area
Pressure = 500N/0.02 meter power square
pressure = 25000 N/m2 or 25000 Pa or 25kPa
The Pressure under Jo's foot wearing heels would be;
5 000 000 N/meter square
Join to answer this question
Join a community of thousands of dedicated teachers and students.Join eNotes