An instrument that measures the intensity of fluorescence (light given off by substances when they absorb other light).
From Latin 'fluere' (to flow) + Greek 'metron' (measure). Though the 'fluo-' prefix suggests flow, here it refers to fluorescence specifically—the property of emitting light.
Fluorimeters are crucial in laboratories and forensics—scientists use them to detect tiny amounts of substances because fluorescence can be much more sensitive than regular light measurement, making them useful for everything from checking water purity to identifying poisons.
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