Turbidity is a measure of water clarity. Which option best describes a common measure used to express this property?

• A. It measures water temperature
• B. It measures water clarity
• C. It measures dissolved oxygen
• D. It measures the salinity of water

Answer: (B)

Turbidity tells us how clear water is—the more particles in the water, the cloudier it appears. This property is commonly expressed by a measure of water clarity, typically reported as turbidity in units like NTU. So, describing a measure as water clarity best fits what turbidity is measuring. The other options refer to different properties: temperature, dissolved oxygen, and salinity, which are not about how clear the water is.