Some Principles of Measurement:
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🈴Photometry:
Photometry relies on measurement of light by a photodetector. The light may be:
1⃣absorbed by a substance dissolved in solution (absorbance),
2⃣the light may be scattered or refracted by particles suspended in solution (turbidimetry or nephelometry), or
3⃣the light may be emitted from a substance that absorbs light at one wavelength and emits light at another wavelength (fluorescence).
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