Enter the volume of oil emulsified, concentration of emulsifier, area of the interface, and density of oil into the calculator to determine the Emulsifying Activity Index.

Emulsifying Activity Index Formula

The following formula is used to calculate the Emulsifying Activity Index (EAI). 

EAI = (2 * V * C) / (A * ρ)

Variables:

  • EAI is the Emulsifying Activity Index (m²/g)
  • V is the volume of oil emulsified (mL)
  • C is the concentration of emulsifier (g/mL)
  • A is the area of the interface (m²)
  • ρ is the density of oil (g/mL)

To calculate the Emulsifying Activity Index, multiply the volume of oil emulsified by the concentration of the emulsifier, then multiply the result by 2. Divide this result by the product of the area of the interface and the density of oil.

What is an Emulsifying Activity Index?

The Emulsifying Activity Index (EAI) is a measure used to determine the ability of a substance to form and stabilize an emulsion. Emulsions are mixtures of two or more immiscible (unblendable) liquids, such as oil and water. The EAI is particularly important in the food, cosmetic, and pharmaceutical industries, where emulsifiers are used to ensure the smooth blending of ingredients. A high EAI indicates a strong emulsifying capacity, which can improve the texture, appearance, and shelf-life of products.

How to Calculate Emulsifying Activity Index?

The following steps outline how to calculate the Emulsifying Activity Index (EAI).

  1. First, determine the volume of oil emulsified (V) in mL.
  2. Next, determine the concentration of emulsifier (C) in g/mL.
  3. Next, determine the area of the interface (A) in m².
  4. Next, determine the density of oil (ρ) in g/mL.
  5. Next, use the formula EAI = (2 * V * C) / (A * ρ) to calculate the Emulsifying Activity Index.
  6. Finally, insert the variables and calculate the result.

Example Problem:

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

Volume of oil emulsified (V) = 50 mL

Concentration of emulsifier (C) = 0.5 g/mL

Area of the interface (A) = 10 m²

Density of oil (ρ) = 0.8 g/mL