Define the term 'turbidity'.

Turbidity refers specifically to the cloudiness or haziness of a fluid, primarily caused by suspended particles such as silt, clay, and organic matter. These particles can scatter light that passes through the water, making it appear less clear. High turbidity levels can indicate the presence of pollutants and can affect water quality, making it an important measurement in water treatment processes.

Understanding turbidity is crucial in the field of water treatment, as it can influence other characteristics of water, such as its taste, odor, and chemical composition. It’s also essential for compliance with health standards and regulations, as clear water is typically a sign of good treatment practices.