Enter the concentration of the substance in the air, the area affected by the resuspension, the volume of air in the affected area, the time period over which the resuspension occurs, and the height of the affected area into the Resuspension Calculator to determine the resuspension rate.

## Resuspension Formula

The following formula is used to calculate the resuspension rate in a Resuspension Calculator:

RR = (C * A * V) / (T * H)

Variables:

- RR is the resuspension rate
- C is the concentration of the substance in the air
- A is the area affected by the resuspension
- V is the volume of air in the affected area
- T is the time period over which the resuspension occurs
- H is the height of the affected area

To calculate the resuspension rate, multiply the concentration of the substance in the air by the area affected by the resuspension, then multiply the result by the volume of air in the affected area. Divide the product by the time period over which the resuspension occurs multiplied by the height of the affected area.

## What is a Resuspension?

Resuspension is a process in which particles that have settled at the bottom of a liquid medium are mixed back into the medium, typically by agitation or shaking. This process is commonly used in various scientific and industrial applications, such as in the field of biology where cells or DNA that have settled at the bottom of a solution need to be evenly distributed throughout the solution for further analysis or experimentation. Resuspension is crucial in these contexts because it ensures that the particles or substances of interest are evenly distributed, allowing for accurate measurements and observations. The process can be done manually by shaking or stirring, or with the use of specialized laboratory equipment like vortex mixers or centrifuges.

## How to Calculate Resuspension?

The following steps outline how to calculate the Resuspension:

- First, determine the initial concentration of particles in the water (C0) in mg/L.
- Next, determine the final concentration of particles in the water (Cf) in mg/L.
- Next, determine the volume of water (V) in liters.
- Next, determine the time interval (t) in hours.
- Finally, calculate the Resuspension using the formula: Resuspension = (Cf – C0) * V / t.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

Initial concentration of particles in the water (C0) = 10 mg/L

Final concentration of particles in the water (Cf) = 20 mg/L

Volume of water (V) = 100 liters

Time interval (t) = 5 hours