✖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%

✖Change in vapour pressure refers to the difference between maximum vapour pressure and actual vapour pressure.ⓘ Change in Vapour Pressure given Evaporation Loss Per Day [δV]

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Formula

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Change in Vapour Pressure given Evaporation Loss Per Day

Formula

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

Example

`"0.199954cmHg"="8.29cm"/("0.75"*(1.465-(0.00732*"74.83cmHg"))*(0.44+(0.0732*"8km/h")))`

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Change in Vapour Pressure given Evaporation Loss Per Day Solution

STEP 0: Pre-Calculation Summary

Formula Used

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)))
δV = E/(C'*(1.465-(0.00732*P_a))*(0.44+(0.0732*u)))
This formula uses 5 Variables

Variables Used

Change in Vapour Pressure - (Measured in Centimeter Mercury (0 °C)) - Change in vapour pressure refers to the difference between maximum vapour pressure and actual vapour pressure.
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

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

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

Evaluating ... ...

δV = 0.199954428335586

STEP 3: Convert Result to Output's Unit

266.58324294557 Pascal -->0.199954428335586 Centimeter Mercury (0 °C) (Check conversion here)

FINAL ANSWER

0.199954428335586 ≈ 0.199954 Centimeter Mercury (0 °C) <-- Change in Vapour Pressure

(Calculation completed in 00.004 seconds)

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Home » Engineering » Civil » Environmental Engineering » Surface Water Hydrology » Evaporation and Transpiration » Change in 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))

Change in 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 Change in Vapour Pressure given Evaporation Loss Per Day?

Change in Vapour Pressure given Evaporation Loss Per Day calculator uses 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))) to calculate the Change in Vapour Pressure, The Change in Vapour Pressure given Evaporation Loss Per Day is defined as the difference between maximum vapour pressure and actual vapour pressure. Change in Vapour Pressure is denoted by δV symbol.

How to calculate Change in Vapour Pressure given Evaporation Loss Per Day using this online calculator? To use this online calculator for Change in Vapour Pressure given Evaporation Loss Per Day, enter 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 Change in Vapour Pressure given Evaporation Loss Per Day calculation can be explained with given input values -> 0.000149 = 0.0829/(0.75*(1.465-(0.00732*99764.8526))*(0.44+(0.0732*2.22222222222222))).

FAQ

What is Change in Vapour Pressure given Evaporation Loss Per Day?

The Change in Vapour Pressure given Evaporation Loss Per Day is defined as the difference between maximum vapour pressure and actual vapour pressure and is represented as δV = E/(C'*(1.465-(0.00732*P_a))*(0.44+(0.0732*u))) or 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))). 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 Change in Vapour Pressure given Evaporation Loss Per Day?

The Change in Vapour Pressure given Evaporation Loss Per Day is defined as the difference between maximum vapour pressure and actual vapour pressure is calculated using 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))). To calculate Change in Vapour Pressure given Evaporation Loss Per Day, you need 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 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 Change in Vapour Pressure?

In this formula, Change in Vapour Pressure uses 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 -

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

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