Reduced Pressure Calculator

✖Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.ⓘ Pressure [p]			+10% -10%
✖Critical Pressure is the minimum pressure required to liquify a substance at the critical temperature.ⓘ Critical Pressure [P_c]			+10% -10%

✖Reduced Pressure is the ratio of the actual pressure of the fluid to its critical pressure. It is dimensionless.ⓘ Reduced Pressure [P_r]

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Formula

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Reduced Pressure

Formula

`"P"_{"r"} = "p"/"P"_{"c"}`

Example

`"1.1E^-6"="38.4Pa"/"33500000Pa"`

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Reduced Pressure Solution

STEP 0: Pre-Calculation Summary

Formula Used

Reduced Pressure = Pressure/Critical Pressure
P_r = p/P_c
This formula uses 3 Variables

Variables Used

Reduced Pressure - Reduced Pressure is the ratio of the actual pressure of the fluid to its critical pressure. It is dimensionless.
Pressure - (Measured in Pascal) - Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
Critical Pressure - (Measured in Pascal) - Critical Pressure is the minimum pressure required to liquify a substance at the critical temperature.

STEP 1: Convert Input(s) to Base Unit

Pressure: 38.4 Pascal --> 38.4 Pascal No Conversion Required
Critical Pressure: 33500000 Pascal --> 33500000 Pascal No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P_r = p/P_c --> 38.4/33500000

Evaluating ... ...

P_r = 1.14626865671642E-06

STEP 3: Convert Result to Output's Unit

1.14626865671642E-06 --> No Conversion Required

FINAL ANSWER

1.14626865671642E-06 ≈ 1.1E-6 <-- Reduced Pressure

(Calculation completed in 00.004 seconds)

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Home » Engineering » Chemical Engineering » Thermodynamics » Volumetric Properties of Pure Fluids » Equation of States » Reduced Pressure

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Created by Suman Ray Pramanik

Indian Institute of Technology (IIT), Kanpur

Suman Ray Pramanik has created this Calculator and 50+ more calculators!

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< 21 Equation of States Calculators

Compressibility Factor using B(0) and B(1) of Pitzer Correlations for Second Virial Coefficient

Go Compressibility Factor = 1+((Pitzer Correlations Coefficient B(0)*Reduced Pressure)/Reduced Temperature)+((Acentric Factor*Pitzer Correlations Coefficient B(1)*Reduced Pressure)/Reduced Temperature)

B(0) given Z(0) using Pitzer Correlations for Second Virial Coefficient

Go Pitzer Correlations Coefficient B(0) = modulus(((Pitzer Correlations Coefficient Z(0)-1)*Reduced Temperature)/Reduced Pressure)

Reduced Second Virial Coefficient using Second Virial Coefficient

Go Reduced Second Virial Coefficient = (Second Virial Coefficient*Critical Pressure)/([R]*Critical Temperature)

Second Virial Coefficient using Reduced Second Virial Coefficient

Go Second Virial Coefficient = (Reduced Second Virial Coefficient*[R]*Critical Temperature)/Critical Pressure

Acentric Factor using B(0) and B(1) of Pitzer Correlations for Second Virial Coefficient

Go Acentric Factor = (Reduced Second Virial Coefficient-Pitzer Correlations Coefficient B(0))/Pitzer Correlations Coefficient B(1)

Reduced Second Virial Coefficient using B(0) and B(1)

Go Reduced Second Virial Coefficient = Pitzer Correlations Coefficient B(0)+Acentric Factor*Pitzer Correlations Coefficient B(1)

Z(0) given B(0) using Pitzer Correlations for Second Virial Coefficient

Go Pitzer Correlations Coefficient Z(0) = 1+((Pitzer Correlations Coefficient B(0)*Reduced Pressure)/Reduced Temperature)

Acentric Factor using Pitzer Correlations for Compressibility Factor

Go Acentric Factor = (Compressibility Factor-Pitzer Correlations Coefficient Z(0))/Pitzer Correlations Coefficient Z(1)

Compressibility Factor using Second Virial Coefficient

Go Compressibility Factor = 1+((Second Virial Coefficient*Pressure)/([R]*Temperature))

Compressibility Factor using Pitzer Correlations for Compressibility Factor

Go Compressibility Factor = Pitzer Correlations Coefficient Z(0)+Acentric Factor*Pitzer Correlations Coefficient Z(1)

Z(1) given B(1) using Pitzer Correlations for Second Virial Coefficient

Go Pitzer Correlations Coefficient Z(1) = (Pitzer Correlations Coefficient B(1)*Reduced Pressure)/Reduced Temperature

B(1) given Z(1) using Pitzer Correlations for Second Virial Coefficient

Go Pitzer Correlations Coefficient B(1) = (Pitzer Correlations Coefficient Z(1)*Reduced Temperature)/Reduced Pressure

Second Virial Coefficient using Compressibility Factor

Go Second Virial Coefficient = ((Compressibility Factor-1)*[R]*Temperature)/Pressure

Compressibility Factor using Reduced Second Virial Coefficient

Go Compressibility Factor = 1+((Reduced Second Virial Coefficient*Reduced Pressure)/Reduced Temperature)

Reduced Second Virial Coefficient using Compressibility Factor

Go Reduced Second Virial Coefficient = ((Compressibility Factor-1)*Reduced Temperature)/Reduced Pressure

Saturated Reduced Pressure at Reduced Temperature 0.7 using Acentric Factor

Go Saturated Reduced Pressure at Reduced Temp 0.7 = exp(-1-Acentric Factor)

Acentric Factor using Saturated Reduced Pressure given at Reduced Temperature 0.7

Go Acentric Factor = -1-ln(Saturated Reduced Pressure at Reduced Temp 0.7)

Reduced Temperature

Go Reduced Temperature = Temperature/Critical Temperature

B(0) using Abbott Equations

Go Pitzer Correlations Coefficient B(0) = 0.083-0.422/(Reduced Temperature^1.6)

B(1) using Abbott Equations

Go Pitzer Correlations Coefficient B(1) = 0.139-0.172/(Reduced Temperature^4.2)

Reduced Pressure

Go Reduced Pressure = Pressure/Critical Pressure

< 8 Pressure Relations Calculators

Relative Humidity

Go Relative Humidity = Specific Humidity*Partial Pressure/((0.622+Specific Humidity)*Vapor Pressure of Pure Component A)

Critical Compressibility

Go Compressibility Factor = (Critical Pressure*Critical Volume*10^(-3))/(Specific Gas Constant*Critical Temperature)

Pseudo-Reduced Specific Volume

Go Pseudo Reduced Specific Volume = Specific Volume*Critical Pressure/([R]*Critical Temperature)

Compressibility Factor

Go Compressibility Factor = (Pressure Object*Specific Volume)/(Specific Gas Constant*Temperature)

Partial Pressure of Water Vapour

Go Partial Pressure = Pressure of Gas*1.8*Atmospheric Pressure*Temperature Difference/2700

Pressure

Go Pressure = 1/3*Density of Gas*Root Mean Square Velocity^2

Reduced Pressure

Go Reduced Pressure = Pressure/Critical Pressure

Mean Effective Pressure

Go Mean Effective Pressure = Work/Displacement

Reduced Pressure Formula

Reduced Pressure = Pressure/Critical Pressure
P_r = p/P_c

What is Reduced Pressure?

Reduced Pressure is the ratio of the pressure of the fluid to its critical pressure. Its values are always greater than 0, and less than or equal to 1. It is often used for thermodynamic calculations.

How to Calculate Reduced Pressure?

Reduced Pressure calculator uses Reduced Pressure = Pressure/Critical Pressure to calculate the Reduced Pressure, Reduced Pressure is the ratio of the pressure of the fluid to its critical pressure. It is dimensionless. Reduced Pressure is denoted by P_r symbol.

How to calculate Reduced Pressure using this online calculator? To use this online calculator for Reduced Pressure, enter Pressure (p) & Critical Pressure (P_c) and hit the calculate button. Here is how the Reduced Pressure calculation can be explained with given input values -> 0.002985 = 38.4/33500000.

FAQ

What is Reduced Pressure?

Reduced Pressure is the ratio of the pressure of the fluid to its critical pressure. It is dimensionless and is represented as P_r = p/P_c or Reduced Pressure = Pressure/Critical Pressure. Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed & Critical Pressure is the minimum pressure required to liquify a substance at the critical temperature.

How to calculate Reduced Pressure?

Reduced Pressure is the ratio of the pressure of the fluid to its critical pressure. It is dimensionless is calculated using Reduced Pressure = Pressure/Critical Pressure. To calculate Reduced Pressure, you need Pressure (p) & Critical Pressure (P_c). With our tool, you need to enter the respective value for Pressure & Critical Pressure and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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