✖The Maximum vapour pressure refers to the highest pressure exerted by a vapour in equilibrium with its liquid at a given temperature, often measured in cm Hg or kPa.ⓘ Maximum Vapour Pressure [V]			+10% -10%
✖Evaporation loss per day refers to the amount of water lost from a surface due to evaporation within a single day, typically measured in millimeters (mm).ⓘ Evaporation Loss per Day [E]			+10% -10%
✖Rohwer's formula constant refers to an empirical coefficient used in Rohwer's equation to estimate evaporation rates, adjusting for local climatic conditions.ⓘ Rohwer's Formula Constant [C']			+10% -10%
✖Atmospheric pressure refers to the force exerted by the weight of the atmosphere on a surface, typically measured in pascals (Pa), millibars (mb), or inches of mercury (inHg).ⓘ Atmospheric Pressure [P_a]			+10% -10%
✖Mean wind velocity refers to the wind in kilometres per hour at a height of about 9 meters above the ground.ⓘ Mean Wind Velocity [u]			+10% -10%

✖The Actual vapour pressure refers to the pressure exerted by the water vapour present in the air, reflecting the current humidity and temperature, typically measured in cm Hg or kPa.ⓘ Actual Vapour Pressure given Evaporation Loss Per Day [v]

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Formula

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Actual Vapour Pressure given Evaporation Loss Per Day

Formula

`"v" = "V"-("E"/("C'"*(1.465-(0.00732*"P"_{"a"}))*(0.44+(0.0732*"u"))))`

Example

`"0.400046cmHg"="0.6cmHg"-("8.29cm"/("0.75"*(1.465-(0.00732*"74.83cmHg"))*(0.44+(0.0732*"8km/h"))))`

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Actual Vapour Pressure given Evaporation Loss Per Day Solution

STEP 0: Pre-Calculation Summary

Formula Used

Actual Vapour Pressure = Maximum Vapour Pressure-(Evaporation Loss per Day/(Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity))))
v = V-(E/(C'*(1.465-(0.00732*P_a))*(0.44+(0.0732*u))))
This formula uses 6 Variables

Variables Used

Actual Vapour Pressure - (Measured in Centimeter Mercury (0 °C)) - The Actual vapour pressure refers to the pressure exerted by the water vapour present in the air, reflecting the current humidity and temperature, typically measured in cm Hg or kPa.
Maximum Vapour Pressure - (Measured in Centimeter Mercury (0 °C)) - The Maximum vapour pressure refers to the highest pressure exerted by a vapour in equilibrium with its liquid at a given temperature, often measured in cm Hg or kPa.
Evaporation Loss per Day - (Measured in Meter) - Evaporation loss per day refers to the amount of water lost from a surface due to evaporation within a single day, typically measured in millimeters (mm).
Rohwer's Formula Constant - Rohwer's formula constant refers to an empirical coefficient used in Rohwer's equation to estimate evaporation rates, adjusting for local climatic conditions.
Atmospheric Pressure - (Measured in Centimeter Mercury (0 °C)) - Atmospheric pressure refers to the force exerted by the weight of the atmosphere on a surface, typically measured in pascals (Pa), millibars (mb), or inches of mercury (inHg).
Mean Wind Velocity - (Measured in Meter per Second) - Mean wind velocity refers to the wind in kilometres per hour at a height of about 9 meters above the ground.

STEP 1: Convert Input(s) to Base Unit

Maximum Vapour Pressure: 0.6 Centimeter Mercury (0 °C) --> 0.6 Centimeter Mercury (0 °C) No Conversion Required
Evaporation Loss per Day: 8.29 Centimeter --> 0.0829 Meter (Check conversion here)
Rohwer's Formula Constant: 0.75 --> No Conversion Required
Atmospheric Pressure: 74.83 Centimeter Mercury (0 °C) --> 74.83 Centimeter Mercury (0 °C) No Conversion Required
Mean Wind Velocity: 8 Kilometer per Hour --> 2.22222222222222 Meter per Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

v = V-(E/(C'*(1.465-(0.00732*P_a))*(0.44+(0.0732*u)))) --> 0.6-(0.0829/(0.75*(1.465-(0.00732*74.83))*(0.44+(0.0732*2.22222222222222))))

Evaluating ... ...

v = 0.400045571664414

STEP 3: Convert Result to Output's Unit

533.34875705443 Pascal -->0.400045571664414 Centimeter Mercury (0 °C) (Check conversion here)

FINAL ANSWER

0.400045571664414 ≈ 0.400046 Centimeter Mercury (0 °C) <-- Actual Vapour Pressure

(Calculation completed in 00.020 seconds)

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Home » Engineering » Civil » Environmental Engineering » Surface Water Hydrology » Evaporation and Transpiration » Actual Vapour Pressure given Evaporation Loss Per Day

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< 17 Evaporation and Transpiration Calculators

Mean Wind Velocity at Ground Level given Evaporation Loss Per Day

Go Mean Wind Velocity = ((Evaporation Loss per Day/(Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(Maximum Vapour Pressure-Actual Vapour Pressure)))-0.44)/0.0732

Constant used in Rohwer's Formula given Evaporation Loss Per Day

Go Rohwer's Formula Constant = Evaporation Loss per Day/((1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity))*(Maximum Vapour Pressure-Actual Vapour Pressure))

Maximum Vapour Pressure given Evaporation Loss Per Day

Go Maximum Vapour Pressure = Actual Vapour Pressure+(Evaporation Loss per Day/(Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity))))

Actual Vapour Pressure given Evaporation Loss Per Day

Go Actual Vapour Pressure = Maximum Vapour Pressure-(Evaporation Loss per Day/(Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity))))

Atmospheric Pressure given Evaporation Loss Per Day

Go Atmospheric Pressure = (1.456-(Evaporation Loss per Day/(Rohwer's Formula Constant*(0.44+(0.0732*Mean Wind Velocity))*(Maximum Vapour Pressure-Actual Vapour Pressure))))/0.00732

Evaporation Loss Per Day

Go Evaporation Loss per Day = Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity))*(Maximum Vapour Pressure-Actual Vapour Pressure)

Constant used in Rohwer's Formula given Change in Vapour Pressure

Go Rohwer's Formula Constant = Evaporation Loss per Day/((1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity))*Change in Vapour Pressure)

Change in Vapour Pressure given Evaporation Loss Per Day

Go Change in Vapour Pressure = Evaporation Loss per Day/(Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity)))

Atmospheric Pressure given Change in Vapour Pressure

Go Atmospheric Pressure = (1.456-(Evaporation Loss per Day/(Rohwer's Formula Constant*(0.44+(0.0732*Mean Wind Velocity))*Change in Vapour Pressure)))/0.00732

Evaporation Loss Per Day given Change in Vapour Pressure

Go Evaporation Loss per Day = Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity))*Change in Vapour Pressure

Monthly Mean Wind Velocity given Evaporation Loss Per Month

Go Mean Wind Velocity = ((Evaporation Loss per Month/(Meyer's Constant*(Maximum Vapour Pressure-Actual Vapour Pressure)))-1)*16

Maximum Vapour Pressure given Evaporation Loss Per Month

Go Maximum Vapour Pressure = Actual Vapour Pressure+(Evaporation Loss per Month/(Meyer's Constant*(1+(Mean Wind Velocity/16))))

Actual Vapour Pressure given Evaporation Loss Per Month

Go Actual Vapour Pressure = Maximum Vapour Pressure-(Evaporation Loss per Month/(Meyer's Constant*(1+(Mean Wind Velocity/16))))

Evaporation Loss Per Month

Go Evaporation Loss per Month = Meyer's Constant*(Maximum Vapour Pressure-Actual Vapour Pressure)*(1+(Mean Wind Velocity/16))

Constant Dependent on Depth of Water Bodies given Change in Vapour Pressure

Go Meyer's Constant = Evaporation Loss per Month/(Change in Vapour Pressure*(1+(Mean Wind Velocity/16)))

Change in Vapour Pressure given Evaporation Loss Per Month

Go Change in Vapour Pressure = Evaporation Loss per Month/(Meyer's Constant*(1+(Mean Wind Velocity/16)))

Evaporation Loss Per Month given Change in Vapour Pressure

Go Evaporation Loss per Month = Meyer's Constant*Change in Vapour Pressure*(1+(Mean Wind Velocity/16))

Actual Vapour Pressure given Evaporation Loss Per Day Formula

What is Vapour Pressure ?

Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature.

How to Calculate Actual Vapour Pressure given Evaporation Loss Per Day?

Actual Vapour Pressure given Evaporation Loss Per Day calculator uses Actual Vapour Pressure = Maximum Vapour Pressure-(Evaporation Loss per Day/(Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity)))) to calculate the Actual Vapour Pressure, The Actual Vapour Pressure given Evaporation Loss Per Day is defined as the pressure exerted by the water vapor present in the air, reflecting the current humidity and temperature, typically measured in cm Hg or kPa. Actual Vapour Pressure is denoted by v symbol.

How to calculate Actual Vapour Pressure given Evaporation Loss Per Day using this online calculator? To use this online calculator for Actual Vapour Pressure given Evaporation Loss Per Day, enter Maximum Vapour Pressure (V), Evaporation Loss per Day (E), Rohwer's Formula Constant (C'), Atmospheric Pressure (P_a) & Mean Wind Velocity (u) and hit the calculate button. Here is how the Actual Vapour Pressure given Evaporation Loss Per Day calculation can be explained with given input values -> 0.000302 = 799.932-(0.0829/(0.75*(1.465-(0.00732*99764.8526))*(0.44+(0.0732*2.22222222222222)))).

FAQ

What is Actual Vapour Pressure given Evaporation Loss Per Day?

The Actual Vapour Pressure given Evaporation Loss Per Day is defined as the pressure exerted by the water vapor present in the air, reflecting the current humidity and temperature, typically measured in cm Hg or kPa and is represented as v = V-(E/(C'*(1.465-(0.00732*P_a))*(0.44+(0.0732*u)))) or Actual Vapour Pressure = Maximum Vapour Pressure-(Evaporation Loss per Day/(Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity)))). The Maximum vapour pressure refers to the highest pressure exerted by a vapour in equilibrium with its liquid at a given temperature, often measured in cm Hg or kPa, Evaporation loss per day refers to the amount of water lost from a surface due to evaporation within a single day, typically measured in millimeters (mm), Rohwer's formula constant refers to an empirical coefficient used in Rohwer's equation to estimate evaporation rates, adjusting for local climatic conditions, Atmospheric pressure refers to the force exerted by the weight of the atmosphere on a surface, typically measured in pascals (Pa), millibars (mb), or inches of mercury (inHg) & Mean wind velocity refers to the wind in kilometres per hour at a height of about 9 meters above the ground.

How to calculate Actual Vapour Pressure given Evaporation Loss Per Day?

The Actual Vapour Pressure given Evaporation Loss Per Day is defined as the pressure exerted by the water vapor present in the air, reflecting the current humidity and temperature, typically measured in cm Hg or kPa is calculated using Actual Vapour Pressure = Maximum Vapour Pressure-(Evaporation Loss per Day/(Rohwer's Formula Constant*(1.465-(0.00732*Atmospheric Pressure))*(0.44+(0.0732*Mean Wind Velocity)))). To calculate Actual Vapour Pressure given Evaporation Loss Per Day, you need Maximum Vapour Pressure (V), Evaporation Loss per Day (E), Rohwer's Formula Constant (C'), Atmospheric Pressure (P_a) & Mean Wind Velocity (u). With our tool, you need to enter the respective value for Maximum Vapour Pressure, Evaporation Loss per Day, Rohwer's Formula Constant, Atmospheric Pressure & Mean Wind Velocity and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Actual Vapour Pressure?

In this formula, Actual Vapour Pressure uses Maximum Vapour Pressure, Evaporation Loss per Day, Rohwer's Formula Constant, Atmospheric Pressure & Mean Wind Velocity. We can use 1 other way(s) to calculate the same, which is/are as follows -

Actual Vapour Pressure = Maximum Vapour Pressure-(Evaporation Loss per Month/(Meyer's Constant*(1+(Mean Wind Velocity/16))))

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