A technique for determining how cloudy or turbid a liquid sample is is called a turbidity assay, often known as a turbidimetric test. It is often used in a variety of scientific disciplines, including industrial operations, environmental monitoring, biochemistry, and microbiology.
The idea behind a turbidity test is that light is scattered by suspended particles or microorganisms in a liquid sample, which results in less light passing through the sample. Researchers can calculate the turbidity of the solution using the reduction in light transmission, which is directly proportional to the number or concentration of particles in the sample.