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Sink Floats What are Sink Floats? Sink floats are used to discernibly measure and observe a liquid's density. The sink floats are small amber glass capsules that are weighted and air tight. Sink floats have been calibrated at 73.4ºF in order to measure a specific liquid density. Sink floats are dropped into  liquid and then the position of the sink float is observed. If the sink float s …