The image above represents relative freezing time.

To compute for relative freezing time, four essential parameters are needed and these parameters are **Constant (L), Constant (C), Volume of Riser/Volume of Casting (y) **and **Relative Contraction of Freezing (B).**

The formula for calculating relative freezing time:

x = ^{L} / _{y – B} + C

Where:

x = Relative Freezing Time

y = Volume of Riser / Volume of Casting

B = Relative Contraction on Freezing

C = Constant

L = Constant

Let’s solve an example;

Find the relative freezing time when the volume of riser/volume of casting is 26, the relative contraction on freezing is 21, the constant is 8 and the constant is 11.

This implies that;

y = Volume of Riser / Volume of Casting = 26

B = Relative Contraction on Freezing = 21

C = Constant = 11

L = Constant = 8

x = ^{L} / _{y – B} + C

x = ^{8} / _{26 – 21} + 11

x = ^{8} / _{5} + 11

x = 1.6 + 11

x = **12.6**

Therefore, the **relative freezing time **is **12.6 s.**

**Calculating the Constant (L) when the Relative Freezing Time, Constant (C), the Volume of riser/Volume of Casting and the Relative Contraction on Freezing is Given.**

L = x (y – B) – C

Where;

L = Constant

x = Relative Freezing Time

y = Volume of riser / Volume of Casting

B = Relative Contraction on Freezing

C = Constant

Let’s solve an example;

Find the Constant when the relative freezing time is 24, the volume of riser / volume of casting is 14, the relative contraction on freezing is 8 and the constant is 10.

This implies that;

x = Relative Freezing Time = 24

y = Volume of riser / Volume of Casting = 14

B = Relative Contraction on Freezing = 8

C = Constant = 10

L = x (y -B) – C

L = 24 (14 – 8) – 10

L = 24 (6) – 10

L = 144 – 10

L = 134

Therefore, the **constant **is **134.**

**Calculating the Constant (C) when the Relative Freezing Time, the Constant (L), the Volume of Riser / Volume of Casting and the Relative Contraction on Freezing is Given.**

C = x (y – B) – L

Where;

C = Constant

x = Relative Freezing Time

y = Volume of Riser / Volume of Casting

B = Relative Contraction on Freezing

L = Constant

Let’s solve an example;

Find the constant when the relative freezing time is 5, the volume of riser / volume of casting is 10, the relative contraction on freezing is 2 and the constant is 4.

This implies that;

x = Relative Freezing Time = 5

y = Volume of Riser / Volume of Casting = 10

B = Relative Contraction on Freezing = 2

L = Constant = 4

C = x (y – B ) – L

C = 5 (10 – 2) – 4

C = 5 (8) – 4

C = 40 – 4

C = 36

Therefore, the **constant **is **36.**

**Calculating the Volume of Riser / Volume of Casting when the Relative Freezing Time, the Constant (L), the Constant (C) and the Relative Contraction on Freezing is Given.**

y = ^{L + C} / _{x} + B

Where;

y = Volume of Riser / Volume of Casting

L = Constant

C = Constant

x = Relative Freezing Time

B = Relative Contraction on Freezing

Let’s solve an example;

Given that the constant is 12, the relative freezing time is 6, the constant is 24 and the relative contraction on freezing is 3. Find the Volume of riser / Volume of casting?

This implies that;

L = Constant = 12

C = Constant = 24

x = Relative Freezing Time = 6

B = Relative Contraction on Freezing = 3

y = ^{L + C} / _{x} + B

y = ^{12 + 24} / _{6} + 3

y = ^{36} / _{6} + 3

y = 6 + 3

y = 9

Therefore, the **volume of riser / volume of casting **is **9.**

**Calculating the Relative Contraction on Freezing when the Relative Freezing Time, the Constant (L), the Constant (C) and the Volume of Riser / Volume of Casting is Given.**

B = y – ^{L + C} / _{x}

Where;

B = Relative Contraction on Freezing

y = Volume of Riser / Volume of Casting

L = Constant

C = Constant

x = Relative Freezing Time

Let’s solve an example;

Find the relative contraction on freezing when the volume of riser / volume of casting is 32, the constant is 20, the constant is 12 and the relative freezing time is 8.

This implies that;

y = Volume of Riser / Volume of Casting = 32

L = Constant = 20

C = Constant = 12

x = Relative Freezing Time = 8

B = y – ^{L + C} / _{x}

B = 32 – ^{20 + 12} / _{8}

B = 32 – ^{32} / _{8}

B = 32 – 4

B = 28

Therefore, the **relative contraction on freezing **is **28.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the relative freezing time.

To get the answer and workings of the relative freezing time 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 **Materials & Metallurgical**** **under **Engineering****.**

Now, Click on **Foundry Technology**** **under **Material & Metallurgical**

Now, Click on **Relative Freezing Time **under **Foundry Technology**

The screenshot below displays the page or activity to enter your values, to get the answer for the relative freezing time according to the respective parameters which are the **Constant (L), Constant (C), Volume of Riser/Volume of Casting (y) **and **Relative Contraction of Freezing (B).**

Now, enter the values appropriately and accordingly for the parameters as required by the **Constant (L)** is **8**,** Constant (C)** is **11**,** Volume of Riser/Volume of Casting (y)** is **26 **and **Relative Contraction of Freezing (B)** is **21**.

Finally, Click on Calculate

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