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Specific Humidity Formula

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Specific Humidity is the ratio of the mass of water vapor to the total mass of the air parcel. Check FAQs

ω = 0.622 \cdot Φ \cdot \frac{PA o}{p partial - Φ \cdot PA o}

ω - Specific Humidity?Φ - Relative Humidity?PA^o - Vapor Pressure of Pure Component A?p_partial - Partial Pressure?

Specific Humidity Example

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Here is how the Specific Humidity equation looks like with Values.

Here is how the Specific Humidity equation looks like with Units.

Here is how the Specific Humidity equation looks like.

0.6206 = 0.622 \cdot 0.6165 \cdot \frac{2700}{3333 - 0.6165 \cdot 2700}

0.6206 = 0.622 \cdot 0.6165 \cdot \frac{2700Pa}{3333Pa - 0.6165 \cdot 2700Pa}

0.6206 = 0.622 \cdot 0.6165 \cdot \frac{2700}{3333 - 0.6165 \cdot 2700}

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Specific Humidity Solution

Follow our step by step solution on how to calculate Specific Humidity?

FIRST Step Consider the formula

ω = 0.622 \cdot Φ \cdot \frac{PA o}{p partial - Φ \cdot PA o}

Next Step Substitute values of Variables

∴

ω = 0.622 \cdot 0.6165 \cdot \frac{2700Pa}{3333Pa - 0.6165 \cdot 2700Pa}

Next Step Prepare to Evaluate

∴

ω = 0.622 \cdot 0.6165 \cdot \frac{2700}{3333 - 0.6165 \cdot 2700}

Next Step Evaluate

∴

ω = 0.620592325202071

LAST Step Rounding Answer

∴

ω = 0.6206

Specific Humidity Formula Elements

Variables

Specific Humidity

Specific Humidity is the ratio of the mass of water vapor to the total mass of the air parcel.

Symbol: ω

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Specific Humidity

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.

Symbol: Φ

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Relative Humidity

Vapor Pressure of Pure Component A

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.

Symbol: PA^o

Measurement: PressureUnit: Pa

Note: Value can be positive or negative.

Formulas to find Vapor Pressure of Pure Component A

Partial Pressure

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.

Symbol: p_partial

Measurement: PressureUnit: Pa

Note: Value can be positive or negative.

Formulas to find Partial Pressure

Other formulas in Refrigeration Parameters category

Go Dew Point Depression

dpd = T - dpt

Go Degree of Saturation

S = \frac{Vw}{V void}

Go Real Refrigerator

RR = \frac{Q low}{W}

Go Relative Density

RD = \frac{ρ}{ρ water}

How to Evaluate Specific Humidity?

Specific Humidity evaluator uses Specific Humidity = 0.622*Relative Humidity*Vapor Pressure of Pure Component A/(Partial Pressure-Relative Humidity*Vapor Pressure of Pure Component A) to evaluate the Specific Humidity, Specific humidity is the ratio of the mass of water vapor to the total mass of the air parcel. Sometimes referred to as the humidity ratio. Specific Humidity is denoted by ω symbol.

How to evaluate Specific Humidity using this online evaluator? To use this online evaluator for Specific Humidity, enter Relative Humidity (Φ), Vapor Pressure of Pure Component A (PA^o) & Partial Pressure (p_partial) and hit the calculate button.

FAQs on Specific Humidity

What is the formula to find Specific Humidity?

The formula of Specific Humidity is expressed as Specific Humidity = 0.622*Relative Humidity*Vapor Pressure of Pure Component A/(Partial Pressure-Relative Humidity*Vapor Pressure of Pure Component A). Here is an example- -0.624815 = 0.622*0.616523*2700/(3333-0.616523*2700).

How to calculate Specific Humidity?

With Relative Humidity (Φ), Vapor Pressure of Pure Component A (PA^o) & Partial Pressure (p_partial) we can find Specific Humidity using the formula - Specific Humidity = 0.622*Relative Humidity*Vapor Pressure of Pure Component A/(Partial Pressure-Relative Humidity*Vapor Pressure of Pure Component A).

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