What is turbidimetry?

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Turbidimetry is about how cloudy a solution is by looking at how much light can pass through it. In a suspension with particles, light is scattered out of the straight path, so less of the incident beam reaches the detector. A turbidimeter measures the transmitted light, and the amount that passes through decreases as turbidity increases. That is why describing turbidimetry as a measurement of the amount of light to pass through a turbid solution is the best fit. By comparison, measuring color intensity relates to colorimetry, measuring light scattered by a sample relates to nephelometry, and measuring mass-to-charge ratio is a mass spectrometry concept.