The image above represents compressional or P waves.

To compute for compressional or P waves, three essential parameters are needed and these parameters are **Dynamic Bulk Modulus of Elasticity (k _{d}), **

**Dynamic Modulus of Rigidity (G**and

_{d})**Elasticity of Rock Mass (p).**

The formula for calculating compressional or P waves:

v_{p} = ^{√[kd + 4/3Gd]} / _{p}

Where:

v_{p} = Compressional or P Waves

k_{d} = Dynamic Bulk Modulus of Elasticity

G_{d} = Dynamic Modulus of Rigidity

p = Elasticity of the Rock Mass

Let’s solve an example;

Given that the dynamic bulk modulus of elasticity is 11, the dynamic modulus of rigidity is 30 and the elasticity of the rock mass is 23. Find the compressional or P waves?

This implies that;

k_{d} = Dynamic Bulk Modulus of Elasticity = 11

G_{d} = Dynamic Modulus of Rigidity = 30

p = Elasticity of the Rock Mass = 23

v_{p} = ^{√[kd + 4/3Gd]} / _{p}

v_{p} = ^{√[11 + 4/3(30)]} / _{23}

v_{p} = ^{√[11 + 40]} / _{23}

v_{p} = ^{√[51]} / _{23}

v_{p} = ^{7.141} / _{23}

v_{p} = 0.310

Therefore, the **compressional or P waves **is **0.310.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the compressional or P waves.

To get the answer and workings of the compressional or P waves 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 1,500 **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 **Geology**** **under **Add-on.**

Now, Click on **Rock Mechanics**** **under **Geology**

Now, Click on **Compressional**** or P Waves** under **Rock Mechanics**

The screenshot below displays the page or activity to enter your values, to get the answer for the compressional or P waves according to the respective parameters which are the **Dynamic Bulk Modulus of Elasticity (k _{d}), **

**Dynamic Modulus of Rigidity (G**and

_{d})**Elasticity of Rock Mass (p).**

Now, enter the values appropriately and accordingly for the parameters as required by the **Dynamic Bulk Modulus of Elasticity (k _{d})** is

**11**,

**Dynamic Modulus of Rigidity (G**is

_{d})**30**and

**Elasticity of Rock Mass (p)**is

**23**.

Finally, Click on Calculate

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