This page provides insight into determining pressure and some functions to help you calculate it!
Calculation
Pressure
Inputs
F
:100.00N
A
:150.00m2
Here are the variables for the equation
A = the area of the object
F = the force
P = the pressure
Output
P
:0.67
P=AF
Gauge Pressure
Inputs
P (system)
:160.00atm
P (atmosphere)
:1.00atm
Output
P (gauge)
:159.00
Pg=Ps−Patm
Explanation
Pressure is the normal force per unit area exerted on an imaginary or real plane surface in a fluid, gas or solid.
Pressure is interesting, as there are so many different types!
Fluid pressure: the compressive stress at some point in a fluid, and happens in open conditions (an "open channel flow") or closed conditions (a "closed conduit").
Explosion or deflagration pressures: pressure as a result of explosives, i.e. explosive gases, mists or air suspensions.
Negative pressures: generally, pressure is negative; however, it can also be negative. For example, bulk solids and liquids can be put under negative absolute pressure by pulling on them.
Stagnation pressure: the pressure a fluid exerts when it is forced to stop moving.
Surface pressure and surface tension: the lateral force per unit length applied perpendicular to the force.
The pressure of an ideal gas: in an ideal gas, pressure varies linearly with temperature and quantity.
Vapour pressure: the pressure of a vapour in thermodynamic equilibrium in a closed system phase, with its condensed phases.
Liquid pressure: pressure felt is due to the weight of the water above an object.
Kinematic pressure: the mathematical expression relating pressure (p) and the constant mass density (ρ, 0).
Pkinematic=ρ0p
To calculate pressure, the following equation is used.
Pressure=AreaForce
Gauge Pressure is the difference between the pressure in a system and the surrounding atmosphere.
Pgauge=Psystem−Patmosphere
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