Relative Humidity Calculator

✖Specific Humidity is the ratio of the mass of water vapor to the total mass of the air parcel.ⓘ Specific Humidity [ω]			+10% -10%
✖Partial Pressure is the notional pressure of that constituent gas if it alone occupied the entire volume of the original mixture at the same temperature.ⓘ Partial Pressure [p_partial]			+10% -10%
✖Vapor Pressure of Pure Component A is the pressure exerted by a liquid or solid molecules of only A in a closed system in which they are in equilibrium with the vapour phase.ⓘ Vapor Pressure of Pure Component A [PA^o]			+10% -10%

✖Relative Humidity is the ratio of the partial pressure of water vapor in the mixture to the vapor pressure of water at a given temperature.ⓘ Relative Humidity [Φ]

⎘ Copy

👎

Formula

✖

Relative Humidity

Formula

Φ = ω \cdot \frac{p partial}{(0.622 + ω) \cdot PA o}

Example

2.1E-5 = 0.25 \cdot \frac{0.2 Pa}{(0.622 + 0.25) \cdot 2700 Pa}

Calculator

LaTeX

Reset

👍

Download Chemical Engineering Formula PDF PDF Image

Relative Humidity Solution

STEP 0: Pre-Calculation Summary

Formula Used

Relative Humidity = Specific Humidity*Partial Pressure/((0.622+Specific Humidity)*Vapor Pressure of Pure Component A)
Φ = ω*p_partial/((0.622+ω)*PA^o)
This formula uses 4 Variables

Variables Used

Relative Humidity - Relative Humidity is the ratio of the partial pressure of water vapor in the mixture to the vapor pressure of water at a given temperature.
Specific Humidity - Specific Humidity is the ratio of the mass of water vapor to the total mass of the air parcel.
Partial Pressure - (Measured in Pascal) - Partial Pressure is the notional pressure of that constituent gas if it alone occupied the entire volume of the original mixture at the same temperature.
Vapor Pressure of Pure Component A - (Measured in Pascal) - Vapor Pressure of Pure Component A is the pressure exerted by a liquid or solid molecules of only A in a closed system in which they are in equilibrium with the vapour phase.

STEP 1: Convert Input(s) to Base Unit

Specific Humidity: 0.25 --> No Conversion Required
Partial Pressure: 0.2 Pascal --> 0.2 Pascal No Conversion Required
Vapor Pressure of Pure Component A: 2700 Pascal --> 2700 Pascal No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Φ = ω*p_partial/((0.622+ω)*PA^o) --> 0.25*0.2/((0.622+0.25)*2700)

Evaluating ... ...

Φ = 2.12368331634387E-05

STEP 3: Convert Result to Output's Unit

2.12368331634387E-05 --> No Conversion Required

FINAL ANSWER

2.12368331634387E-05 ≈ 2.1E-5 <-- Relative Humidity

(Calculation completed in 00.004 seconds)

You are here -

Home » Engineering » Chemical Engineering » Thermodynamics » Ideal Gas » Relative Humidity

Credits

Created by Team Softusvista

Softusvista Office (Pune), India

Team Softusvista has created this Calculator and 600+ more calculators!

Verified by Himanshi Sharma

Bhilai Institute of Technology (BIT), Raipur

Himanshi Sharma has verified this Calculator and 800+ more calculators!

< Ideal Gas Calculators

Heat Transfer in Isochoric Process

Go Heat Transferred in Thermodynamic Process = Number of Moles of Ideal Gas*Molar Specific Heat Capacity at Constant Volume*Temperature Difference

Change in Internal Energy of System

Go Change in Internal Energy = Number of Moles of Ideal Gas*Molar Specific Heat Capacity at Constant Volume*Temperature Difference

Enthalpy of System

Go System Enthalpy = Number of Moles of Ideal Gas*Molar Specific Heat Capacity at Constant Pressure*Temperature Difference

Specific Heat Capacity at Constant Pressure

Go Molar Specific Heat Capacity at Constant Pressure = [R]+Molar Specific Heat Capacity at Constant Volume

< Pressure Relations Calculators

Relative Humidity

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

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

Mean Effective Pressure

Go Mean Effective Pressure = Work/Displacement

Relative Humidity Formula

Relative Humidity = Specific Humidity*Partial Pressure/((0.622+Specific Humidity)*Vapor Pressure of Pure Component A)
Φ = ω*p_partial/((0.622+ω)*PA^o)

What is Relative Humidity?

The relative humidity of an air-water mixture is defined as the ratio of the partial pressure of water vapor in the mixture to the equilibrium vapor pressure of water over a flat surface of pure water[10] at a given temperature.
The relative humidity is normally expressed as a percentage; a higher percentage means that the air-water mixture is more humid. At 100% relative humidity, the air is saturated and is at its dew point.

How to Calculate Relative Humidity?

Relative Humidity calculator uses Relative Humidity = Specific Humidity*Partial Pressure/((0.622+Specific Humidity)*Vapor Pressure of Pure Component A) to calculate the Relative Humidity, Relative Humidity is the ratio of the partial pressure of water vapor in the mixture to the vapor pressure of water at a given temperature. Relative Humidity is denoted by Φ symbol.

How to calculate Relative Humidity using this online calculator? To use this online calculator for Relative Humidity, enter Specific Humidity (ω), Partial Pressure (p_partial) & Vapor Pressure of Pure Component A (PA^o) and hit the calculate button. Here is how the Relative Humidity calculation can be explained with given input values -> 0.000796 = 0.25*0.2/((0.622+0.25)*2700).

FAQ

What is Relative Humidity?

Relative Humidity is the ratio of the partial pressure of water vapor in the mixture to the vapor pressure of water at a given temperature and is represented as Φ = ω*p_partial/((0.622+ω)*PA^o) or Relative Humidity = Specific Humidity*Partial Pressure/((0.622+Specific Humidity)*Vapor Pressure of Pure Component A). Specific Humidity is the ratio of the mass of water vapor to the total mass of the air parcel, Partial Pressure is the notional pressure of that constituent gas if it alone occupied the entire volume of the original mixture at the same temperature & Vapor Pressure of Pure Component A is the pressure exerted by a liquid or solid molecules of only A in a closed system in which they are in equilibrium with the vapour phase.

How to calculate Relative Humidity?

Relative Humidity is the ratio of the partial pressure of water vapor in the mixture to the vapor pressure of water at a given temperature is calculated using Relative Humidity = Specific Humidity*Partial Pressure/((0.622+Specific Humidity)*Vapor Pressure of Pure Component A). To calculate Relative Humidity, you need Specific Humidity (ω), Partial Pressure (p_partial) & Vapor Pressure of Pure Component A (PA^o). With our tool, you need to enter the respective value for Specific Humidity, Partial Pressure & Vapor Pressure of Pure Component A and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

Home

FREE PDFs

🔍 Search