The image above represents exposure rate of chemical.

To compute for exposure rate of chemical, four essential parameters are needed and these parameters are **Diffusion Coefficient (D), Area of Contact (A), Safety Factor (S _{A})** and

**length (l).**

The formula for calculating exposure rate of chemical:

r_{e} = ^{DASA}/_{l}

Where:

r_{e} = Exposure Rate of Chemicals

D = Diffusion Coefficient

A = Area of Contact

S_{A} = Safety Factor

l = Length

Let’s solve an example;

Find the exposure rate of chemicals when the diffusion coefficient is 10, the area of contact is 14, the safety factor is 12 and the length is 8.

This implies that;

D = Diffusion Coefficient = 10

A = Area of Contact = 14

S_{A} = Safety Factor = 12

l = Length = 8

r_{e} = ^{DASA}/_{l}

r_{e} = ^{(10)(14)(12)}/_{8}

r_{e} = ^{1680}/_{8}

r_{e} = 210

Therefore, the **exposure rate of chemicals** is **210.**

**Calculating the Diffusion Coefficient when the Exposure Rate of Chemicals, the Area of Contact, the Safety Factor and the Length is Given.**

D = ^{re x l} / _{AS}_{A}

Where;

D = Diffusion Coefficient

r_{e} = Exposure Rate of Chemicals

A = Area of Contact

S_{A} = Safety Factor

l = Length

Let’s solve an example;

Find the diffusion coefficient when the exposure rate of chemicals is 20, the area of contact is 8, the safety factor is 4 and the length is 2.

This implies that;

r_{e} = Exposure Rate of Chemicals = 20

A = Area of Contact = 8

S_{A} = Safety Factor = 4

l = Length = 2

D = ^{re x l} / _{AS}_{A}

D = ^{20 x 2} / _{8(4)}

D = ^{40} / _{32}

D = 1.25

Therefore, the **diffusion coefficient **is **1.25.**

Continue reading How to Calculate and Solve for Exposure Rate of Chemicals | Material Selection