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Vapour Density Formula

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Vapor Density is defined as the mass of water vapor present in 1 m³ of dry air. It is also called absolute humidity. Check FAQs

ρ v = \frac{ω \cdot (p t - p v)}{287 \cdot t d}

ρ_v - Vapor Density?ω - Specific Humidity?p_t - Total Pressure of Moist Air?p_v - Pressure of Water Vapor?t_d - Dry Bulb Temperature?

Vapour Density Example

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Here is how the Vapour Density equation looks like with Values.

Here is how the Vapour Density equation looks like with Units.

Here is how the Vapour Density equation looks like.

32.1055 = \frac{0.25 \cdot (189 - 60)}{287 \cdot 350}

32.1055kg/m³ = \frac{0.25 \cdot (189Bar - 60Bar)}{287 \cdot 350K}

32.1055 = \frac{0.25 \cdot (189 - 60)}{287 \cdot 350}

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Vapour Density Solution

Follow our step by step solution on how to calculate Vapour Density?

FIRST Step Consider the formula

ρ v = \frac{ω \cdot (p t - p v)}{287 \cdot t d}

Next Step Substitute values of Variables

∴

ρ v = \frac{0.25 \cdot (189Bar - 60Bar)}{287 \cdot 350K}

Next Step Convert Units

∴

ρ v = \frac{0.25 \cdot (1.9E+7Pa - 6E+6Pa)}{287 \cdot 350K}

Next Step Prepare to Evaluate

∴

ρ v = \frac{0.25 \cdot (1.9E+7 - 6E+6)}{287 \cdot 350}

Next Step Evaluate

∴

ρ v = 32.105525136884kg/m³

LAST Step Rounding Answer

∴

ρ v = 32.1055kg/m³

Vapour Density Formula Elements

Variables

Vapor Density

Vapor Density is defined as the mass of water vapor present in 1 m³ of dry air. It is also called absolute humidity.

Symbol: ρ_v

Measurement: DensityUnit: kg/m³

Note: Value can be positive or negative.

Formulas to find Vapor Density

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

Total Pressure of Moist Air

Total Pressure of Moist Air is the pressure exerted by the mixture of air and water vapour which is equal to the sum of the respected pressures. It is also called barometric pressure.

Symbol: p_t

Measurement: PressureUnit: Bar

Note: Value can be positive or negative.

Formulas to find Total Pressure of Moist Air

Pressure of Water Vapor

Pressure of Water Vapor is the pressure exerted by the water vapour in the moist air or the mixture of dry air and water vapour.

Symbol: p_v

Measurement: PressureUnit: Bar

Note: Value can be positive or negative.

Formulas to find Pressure of Water Vapor

Dry Bulb Temperature

Dry bulb temperature is the temperature of air measured by a thermometer freely exposed to the air but shielded from radiation and moisture.

Symbol: t_d

Measurement: TemperatureUnit: K

Note: Value can be positive or negative.

Formulas to find Dry Bulb Temperature

Other formulas in Vapour Density category

Go Dry Bulb Temperature given Vapor Density

t d = \frac{ω \cdot (p t - p v)}{287 \cdot ρ v}

Go Specific Humidity given Vapor Density

ω = \frac{ρ v \cdot t d \cdot 287}{p t - p v}

Go Partial Pressure of Vapor given Vapor Density

p v = p t - (\frac{ρ v \cdot 287 \cdot t d}{ω})

Go Partial Pressure of Dry Air given Vapor Density

p a = \frac{ρ v \cdot 287 \cdot t d}{ω}

How to Evaluate Vapour Density?

Vapour Density evaluator uses Vapor Density = (Specific Humidity*(Total Pressure of Moist Air-Pressure of Water Vapor))/(287*Dry Bulb Temperature) to evaluate the Vapor Density, The Vapour Density formula calculates the vapor density which is the mass of water vapor present in 1 cubic meter of dry air. Vapor Density is denoted by ρ_v symbol.

How to evaluate Vapour Density using this online evaluator? To use this online evaluator for Vapour Density, enter Specific Humidity (ω), Total Pressure of Moist Air (p_t), Pressure of Water Vapor (p_v) & Dry Bulb Temperature (t_d) and hit the calculate button.

FAQs on Vapour Density

What is the formula to find Vapour Density?

The formula of Vapour Density is expressed as Vapor Density = (Specific Humidity*(Total Pressure of Moist Air-Pressure of Water Vapor))/(287*Dry Bulb Temperature). Here is an example- 9.955202 = (0.25*(18900000-6000000))/(287*350).

How to calculate Vapour Density?

With Specific Humidity (ω), Total Pressure of Moist Air (p_t), Pressure of Water Vapor (p_v) & Dry Bulb Temperature (t_d) we can find Vapour Density using the formula - Vapor Density = (Specific Humidity*(Total Pressure of Moist Air-Pressure of Water Vapor))/(287*Dry Bulb Temperature).

Can the Vapour Density be negative?

Yes, the Vapour Density, measured in Density can be negative.

Which unit is used to measure Vapour Density?

Vapour Density is usually measured using the Kilogram per Cubic Meter[kg/m³] for Density. Kilogram per Cubic Centimeter[kg/m³], Gram per Cubic Meter[kg/m³], Gram per Cubic Centimeter[kg/m³] are the few other units in which Vapour Density can be measured.

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Vapour Density Formula

Vapour Density Example

Vapour Density Solution

Vapour Density Formula Elements

Other formulas in Vapour Density category

How to Evaluate Vapour Density?

FAQs on Vapour Density

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