Which physical characteristic indicates the amount of suspended matter?

Which physical characteristic indicates the amount of suspended matter?

• A. Temperature
• B. Turbidity
• C. Odor
• D. Color

Answer: (B)

Turbidity is the best indicator because it measures how cloudy water is due to suspended solids. When tiny particles like silt, clay, or plankton are floating in the water, they scatter and absorb light, making the water appear turbid or opaque. The more suspended matter present, the higher the turbidity reading. Other characteristics don’t directly reflect the amount of suspended material. Temperature relates to heat content and affects dissolved substances and reaction rates rather than how much solid is floating. Odor signals certain chemical or biological processes but not the quantity of suspended particles. Color can come from dissolved substances or minerals and isn’t a reliable measure of suspended solids, since a sample can be colored without being turbid and vice versa. In water treatment and testing, turbidity is used specifically to gauge the cloudiness caused by suspended matter, guiding filtration needs and disinfection effectiveness.

Turbidity is the best indicator because it measures how cloudy water is due to suspended solids. When tiny particles like silt, clay, or plankton are floating in the water, they scatter and absorb light, making the water appear turbid or opaque. The more suspended matter present, the higher the turbidity reading.

Other characteristics don’t directly reflect the amount of suspended material. Temperature relates to heat content and affects dissolved substances and reaction rates rather than how much solid is floating. Odor signals certain chemical or biological processes but not the quantity of suspended particles. Color can come from dissolved substances or minerals and isn’t a reliable measure of suspended solids, since a sample can be colored without being turbid and vice versa.

In water treatment and testing, turbidity is used specifically to gauge the cloudiness caused by suspended matter, guiding filtration needs and disinfection effectiveness.