Which of the following instruments is used to determine the purity of a milk sample?
Lactometer
Correct Answer: Lactometer
A lactometer is a hydrometer specifically designed to measure the specific gravity (relative density) of milk to determine its purity.
- Pure milk has a specific gravity of about 1.026–1.034.
- If milk is diluted with water, its density decreases → lactometer sinks lower → indicates adulteration.
- Works on Archimedes' principle of buoyancy.
Other instruments: Thermometer (temperature), Barometer (atmospheric pressure), Hydrometer (density of liquids generally).
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