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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

  1. A = the area of the object
  2. F = the force
  1. P = the pressure

Output



P
:0.67


P=FAP=\frac{F}{A}

Gauge Pressure

Inputs



P (system)
:160.00atm



P (atmosphere)
:1.00atm


Output



P (gauge)
:159.00


Pg=PsPatmP_{g}=P_{s}-P_{atm}

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!

  1. 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").
  2. Explosion or deflagration pressures: pressure as a result of explosives, i.e. explosive gases, mists or air suspensions.
  3. 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.
  4. Stagnation pressure: the pressure a fluid exerts when it is forced to stop moving.
  5. Surface pressure and surface tension: the lateral force per unit length applied perpendicular to the force.
  6. The pressure of an ideal gas: in an ideal gas, pressure varies linearly with temperature and quantity.
  7. Vapour pressure: the pressure of a vapour in thermodynamic equilibrium in a closed system phase, with its condensed phases.
  8. Liquid pressure: pressure felt is due to the weight of the water above an object.
  1. Kinematic pressure: the mathematical expression relating pressure (p) and the constant mass density (ρ, 0).

Pkinematic=pρ0P_{kinematic}=\frac{p}{\rho_0}
To calculate pressure, the following equation is used.

Pressure=ForceAreaPressure =\frac{Force}{Area}
Gauge Pressure is the difference between the pressure in a system and the surrounding atmosphere.

Pgauge=PsystemPatmosphereP_{gauge}=P_{system}-P_{atmosphere}

Related Resources

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