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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 moist air, usually expressed in grams of water vapor per kilogram of air (g/kg). Check FAQs

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

SH - 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

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

Next Step Substitute values of Variables

∴

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

Next Step Prepare to Evaluate

∴

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

Next Step Evaluate

∴

SH = 0.620592325202071

LAST Step Rounding Answer

∴

SH = 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 moist air, usually expressed in grams of water vapor per kilogram of air (g/kg).

Symbol: SH

Measurement: NAUnit: Unitless

Note: Value should be less than 1.

Formulas to find Specific Humidity

Relative Humidity

Relative humidity is the amount of water vapor present in the air, expressed as a percentage of the maximum amount of water vapor the air can hold 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 its vapor when the liquid (or solid) phase is in equilibrium with its vapor phase at a given temperature in a closed system.

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 refers to the pressure exerted by a single gas within a mixture of gases, the pressure that the gas would exert if it occupied the entire volume of the mixture.

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

d pd = T - d pt

Go Degree of Saturation

S = \frac{V w}{V v}

Go Real Refrigerator

R = \frac{Q low}{W}

Go Relative Density

R D = \frac{ρ}{ρ w}

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 formula is defined as a measure of the mass of water vapor present in a given mass of air. It is essential for understanding moisture content in various thermodynamic processes, particularly in refrigeration and climate control applications. Specific Humidity is denoted by SH 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- 0.620592 = 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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