How to Calculate and Solve for Weighing Factor | Methods of Application of Water

Last Updated on September 29, 2020

The image above represents weighing factor.

To compute for weighing factor, two essential parameters are needed and these parameters are Slope of Saturated Vapour Pressure versus Temperature Curve (D) and Psychometric Constant (Y).

The formula for calculating weighing factor:

W = ^D / _{(D + Y)}

Where:

W = Weighing Factor
D = Slope of Saturated Vapour Pressure versus Temperature Curve
Y = Psychometric Constant

Let’s solve an example;
Find the weighing factor when the slope of saturated vapour pressure versus temperature curve is 14 and the psychometric constant is 18.

This implies that;

D = Slope of Saturated Vapour Pressure versus Temperature Curve = 14
Y = Psychometric Constant = 18

W = ^D / _{(D + Y)}
W = ¹⁴ / _{(14 + 18)}
W = ¹⁴ / ₃₂
W = 0.4375

Therefore, the weighing factor is 0.4375.

Calculating for the Psychometric Constant when the Weighing Factor and the Slope of Saturated Vapour Pressure versus Temperature Curve is Given.

Y = ^D / _w – D

Where;

Y = Psychometric Constant
W = Weighing Factor
D = Slope of Saturated Vapour Pressure versus Temperature Curve

Let’s solve an example;
Find the psychometric constant when the weighing factor is 4, the slope of saturated vapour pressure versus temperature curve is 8.

This implies that;

W = Weighing Factor = 4
D = Slope of Saturated Vapour Pressure versus Temperature Curve = 8

Y = ^D / _w – D
Y = ⁸ / ₄ – 8
Y = 2 – 8
Y = – 6

Therefore, the psychometric constant is -6.

Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the weighing factor.

To get the answer and workings of the weighing factor using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.

You can get this app via any of these means:

Web – https://www.nickzom.org/calculator-plus

To get access to the professional version via web, you need to register and subscribe for NGN 2,000 per annum to have utter access to all functionalities.
You can also try the demo version via https://www.nickzom.org/calculator

Android (Paid) – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator
Android (Free) – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator
Apple (Paid) – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Agricultural under Engineering.

Now, Click on Methods of Application of Water under Agricultural

Now, Click on Weighing Factor under Methods of Application of Water

The screenshot below displays the page or activity to enter your values, to get the answer for the weighing factor according to the respective parameters which is the Slope of Saturated Vapour Pressure versus Temperature Curve (D) and Psychometric Constant (Y).

Now, enter the values appropriately and accordingly for the parameters as required by the Slope of Saturated Vapour Pressure versus Temperature Curve (D) is 14 and Psychometric Constant (Y) is 18.

Finally, Click on Calculate

As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the weighing factor and presents the formula, workings and steps too.