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Partial pressure of water vapor in air Formula

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Partial pressure in air of the water vapor is the pressure of water in the mixture of water and air. Check FAQs

P∞ = Pw - (\frac{h Conv \cdot (T∞ - T w)}{hfg \cdot k L})

P∞ - Partial Pressure in air?Pw - Partial Pressure?h_Conv - Convective Heat Transfer Coefficient?T∞ - Air Temperature?T_w - Wet Bulb Temperature?hfg - Enthalpy of Evaporation?k_L - Convective Mass Transfer Coefficient?

Partial pressure of water vapor in air Example

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Here is how the Partial pressure of water vapor in air equation looks like with Values.

Here is how the Partial pressure of water vapor in air equation looks like with Units.

Here is how the Partial pressure of water vapor in air equation looks like.

0.7193 = 13 - (\frac{0.5 \cdot (35 - 14)}{90 \cdot 0.0095})

0.7193 = 13 - (\frac{0.5W/m²*K \cdot (35 - 14)}{90J/kg*K \cdot 0.0095m/s})

0.7193 = 13 - (\frac{0.5 \cdot (35 - 14)}{90 \cdot 0.0095})

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Partial pressure of water vapor in air Solution

Follow our step by step solution on how to calculate Partial pressure of water vapor in air?

FIRST Step Consider the formula

P∞ = Pw - (\frac{h Conv \cdot (T∞ - T w)}{hfg \cdot k L})

Next Step Substitute values of Variables

∴

P∞ = 13 - (\frac{0.5W/m²*K \cdot (35 - 14)}{90J/kg*K \cdot 0.0095m/s})

Next Step Prepare to Evaluate

∴

P∞ = 13 - (\frac{0.5 \cdot (35 - 14)}{90 \cdot 0.0095})

Next Step Evaluate

∴

P∞ = 0.719298245614034

LAST Step Rounding Answer

∴

P∞ = 0.7193

Partial pressure of water vapor in air Formula Elements

Variables

Partial Pressure in air

Partial pressure in air of the water vapor is the pressure of water in the mixture of water and air.

Symbol: P∞

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Partial Pressure in air

Open Variable

Partial Pressure

Partial pressure of the water vapor at wet bulb temperature.

Symbol: Pw

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Partial Pressure

Open Variable

Convective Heat Transfer Coefficient

Convective Heat Transfer Coefficient is the heat transfer due to convection.

Symbol: h_Conv

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value can be positive or negative.

Formulas to find Convective Heat Transfer Coefficient

Open Variable

Air Temperature

Air temperature is the temperature of the air surrounding an individual and is typically measured in degrees Celsius (°C) or in Kelvin.

Symbol: T∞

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Air Temperature

Open Variable

Wet Bulb Temperature

Wet Bulb Temperature is the temperature of the wet bulb and denoted by the symbol Tw.

Symbol: T_w

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Wet Bulb Temperature

Open Variable

Enthalpy of Evaporation

Enthalpy of evaporation is the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas.

Symbol: hfg

Measurement: Specific EntropyUnit: J/kg*K

Note: Value can be positive or negative.

Formulas to find Enthalpy of Evaporation

Open Variable

Convective Mass Transfer Coefficient

Convective Mass Transfer Coefficient is a function of geometry of the system and the velocity and properties of the fluid similar to the heat transfer coefficient.

Symbol: k_L

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Convective Mass Transfer Coefficient

Open Variable

Other formulas in Humidification category

Go Enthalpy of evaporation for water in humidification

hfg = \frac{h Conv \cdot (T∞ - T w)}{k L \cdot (Pw - P∞)}

Go Convective mass transfer coefficient in humidification

k L = \frac{h Conv \cdot (T∞ - T w)}{hfg \cdot (Pw - P∞)}

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How to Evaluate Partial pressure of water vapor in air?

Partial pressure of water vapor in air evaluator uses Partial Pressure in air = Partial Pressure-((Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Enthalpy of Evaporation*Convective Mass Transfer Coefficient)) to evaluate the Partial Pressure in air, Partial pressure of water vapor in air formula is defined as the partial pressure of the water vapor in the air as calculated from heat transfer coefficients. Partial Pressure in air is denoted by P∞ symbol.

How to evaluate Partial pressure of water vapor in air using this online evaluator? To use this online evaluator for Partial pressure of water vapor in air, enter Partial Pressure (Pw), Convective Heat Transfer Coefficient (h_Conv), Air Temperature (T∞), Wet Bulb Temperature (T_w), Enthalpy of Evaporation (hfg) & Convective Mass Transfer Coefficient (k_L) and hit the calculate button.

FAQs on Partial pressure of water vapor in air

What is the formula to find Partial pressure of water vapor in air?

The formula of Partial pressure of water vapor in air is expressed as Partial Pressure in air = Partial Pressure-((Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Enthalpy of Evaporation*Convective Mass Transfer Coefficient)). Here is an example- -0.815789 = 13-((0.5*(35-14))/(90*0.0095)).

How to calculate Partial pressure of water vapor in air?

With Partial Pressure (Pw), Convective Heat Transfer Coefficient (h_Conv), Air Temperature (T∞), Wet Bulb Temperature (T_w), Enthalpy of Evaporation (hfg) & Convective Mass Transfer Coefficient (k_L) we can find Partial pressure of water vapor in air using the formula - Partial Pressure in air = Partial Pressure-((Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Enthalpy of Evaporation*Convective Mass Transfer Coefficient)).

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