The image above represents heat diffusivity.

To compute for heat diffusivity, three essential parameters are needed and these parameters are **Thermal Conductivity (K), Density (ρ) **and **Heat Capacity at Constant Pressure (c _{p}).**

α = Kρc_{p}

Where:

α = Heat Diffusivity

K = Thermal Conductivity

ρ = Density

c_{p} = Heat Capacity at Constant Pressure

Let’s solve an example;

Find the heat diffusivity when the thermal conductivity is 10, the density is 12 and the heat capacity at constant pressure is 18.

This implies that;

K = Thermal Conductivity = 10

ρ = Density = 12

c_{p} = Heat Capacity at Constant Pressure = 18

α = Kρc_{p}

α = (10)(12)(18)

α = 2160

Therefore, the **heat diffusivity **is **2160 m²/s.**

**Calculating the Thermal Conductivity when the Heat Diffusivity, the Density and the Heat Capacity at Constant Pressure is Given.**

K = ^{α} / _{ρcp}

Where:

K = Thermal Conductivity

α = Heat Diffusivity

ρ = Density

c_{p} = Heat Capacity at Constant Pressure

Let’s solve an example;

Find the thermal conductivity when the heat diffusivity is 15, the density is 10 and the heat capacity at constant pressure is 14.

This implies that;

α = Heat diffusivity = 15

ρ = Density = 10

c_{p} = Heat Capacity at Constant Pressure = 14

K = ^{α} / _{ρcp}

K = ^{15} / _{10 (14)}

K = ^{15} / _{140}

K = 0.107

Therefore, the **thermal conductivity **is **0.107.**

**Calculating the Density when the Heat Diffusivity, the Thermal Conductivity and the Heat Capacity at Constant Pressure is Given.**

ρ = ^{α} / _{K x cp}

Where:

ρ = Density

α = Heat Diffusivity

K = Thermal Conductivity

c_{p} = Heat Capacity at Constant Pressure

Let’s solve an example;

Find the density when the heat diffusivity is 18, the thermal conductivity is 12 and the heat capacity at constant pressure is 4.

This implies that;

α = Heat Diffusivity = 18

K = Thermal Conductivity = 12

c_{p} = Heat Capacity at Constant Pressure = 4

ρ = ^{α} / _{K x cp}

ρ = ^{18} / _{12 x 4}

ρ = ^{18} / _{48}

ρ = 0.375

Therefore, the **density **is **0.375.**

**Calculating the Heat Capacity at Constant Pressure when the Heat Diffusivity, the Thermal Conductivity and the Density is Given.**

c_{p} = ^{α} / _{K x ρ}

Where:

c_{p} = Heat Capacity at Constant Pressure

α = Heat Diffusivity

K = Thermal Conductivity

ρ = Density

Let’s solve an example;

Find the heat capacity at constant pressure when the heat diffusivity is 10, the thermal conductivity is 20 and the density is 6.

This implies that;

α = Heat Diffusivity = 10

K = Thermal Conductivity = 20

ρ = Density = 6

c_{p} = ^{α} / _{K x ρ}

c_{p} = ^{10} / _{20 x 6}

c_{p} = ^{10} / _{120}

c_{p} = 0.083

Therefore, the **heat capacity at constant pressure **is **0.083.**

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

To get the answer and workings of the heat diffusivity 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 **Solidification of Metal **under **Materials and Metallurgical**

Now, Click on **Heat Diffusivity **under **Solidification of Metal
**

The screenshot below displays the page or activity to enter your values, to get the answer for the heat diffusivity according to the respective parameter which is the **Thermal Conductivity (K), Density (ρ) **and **Heat Capacity at Constant Pressure (c _{p}).**

Now, enter the values appropriately and accordingly for the parameters as required by the **Thermal Conductivity (K)** is **10**,** Density (ρ)** is **12 **and **Heat Capacity at Constant Pressure (c _{p})** is

**18**.

Finally, Click on Calculate

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