Turbidity

Turbidity measures how cloudy a liquid is because suspended particles scatter and absorb light. It is an optical property, not a direct measurement of particle concentration.

Light scattering: The redirection of light by particles, molecules, or irregularities in a material. Suspended particles make water turbid by redirecting light from its original path.
Drinking water treatment: Processes that remove contaminants from water to make it safe for consumption. Treatment plants monitor turbidity to assess particle removal and filter performance.
Suspended solids: Solid particles dispersed in a fluid that remain suspended rather than dissolving or settling immediately. These particles are the main physical contributors to water cloudiness.
Total suspended solids: A gravimetric measure of the dry mass of particles retained from a known volume of water. Unlike turbidity, it measures particle mass directly rather than an optical response.
Nephelometry: An analytical method that estimates suspended material by measuring light scattered at an angle. Many turbidity meters infer cloudiness from light scattered sideways by a water sample.
Water quality: The physical, chemical, and biological condition of water relative to its uses or ecological roles. Turbidity is one indicator used to characterize water's physical condition.
Suspended sediment: Mineral and organic particles carried within the water column. Sediment is a common source of particle scattering in natural waters.
Water transparency: The degree to which light passes through water without being blocked or scattered. Transparency describes light penetration, while turbidity quantifies cloudiness through instrument readings.
Turbidimeter: An instrument that measures the attenuation or scattering of light by a sample. It converts an optical signal from a water sample into a turbidity reading.
Water clarity: The visual transparency of water, determined by how far light can penetrate it. Clarity is a visible effect related to turbidity, but it is not the same measurement.

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