The image above represents permeability.

To compute for permeability, five essential parameters are needed and these parameters are **Constant (A), Partial Pressure (P _{o}), Activation due to Permeation (Q_{p}), Gas Constant (R) **and

**Temperature (T).**

The formula for calculating permeability:

P = AP_{o}^{0.5} . e^{-Qp/RT}

Where:

P = Permeability

A = Constant

P_{o} = Partial Pressure

Q_{p} = Activation due to Permeation

R = Gas Constant

T = Temperature

Let’s solve an example;

Find the permeability when the constant is 12, the partial pressure is 22, the activation due to permeation is 10, the gas constant is 14 and the temperature is 2.

This implies that;

A = Constant = 12

P_{o} = Partial Pressure = 22

Q_{p} = Activation due to Permeation = 10

R = Gas Constant = 14

T = Temperature = 2

P = AP_{o}^{0.5} . e^{-Qp/RT}

P = 12(22)^{0.5} . e^{-(10)/(14)(2)}

P = 12(4.69) . e^{-10/28}

P = 56.28 . e^{-0.357}

P = 56.28 (0.699)

P = 39.38

Therefore, the **permeability **is **39.38.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the permeability.

To get the answer and workings of the permeability 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 **Materials and Metallurgical **under **Engineering****.**

Now, Click on **Mass Transport **under **Materials and Metallurgical**

Now, Click on **Permeability **under **Mass Transport**

The screenshot below displays the page or activity to enter your values, to get the answer for the permeability according to the respective parameter which is the **Constant (A), Partial Pressure (P _{o}), Activation due to Permeation (Q_{p}), Gas Constant (R) **and

**Temperature (T).**

Now, enter the values appropriately and accordingly for the parameters as required by the **Constant (A)** is **12**,** Partial Pressure (P _{o})** is

**22**,

**Activation due to Permeation (Q**is

_{p})**10**,

**Gas Constant (R)**is

**14**and

**Temperature (T)**is

**2**.

Finally, Click on Calculate

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