Question : Which of the following pairings is incorrect?
Option 1: Hygrometer- water vapour content of the atmosphere
Option 2: Lactometer - Specific gravity of liquids
Option 3: Anemometer- Speed of the wind
Option 4: Seismograph- Earthquakes
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Correct Answer: Lactometer - Specific gravity of liquids
Solution : The correct option is the Lactometer - specific gravity of liquids .
A hydrometer or lactometer is a device that uses the concept of buoyancy to measure the density or relative density of liquids. Typically, they are graduated and calibrated using one or more scales, like specific gravity. A lactometer measures the specific gravity of milk, not liquids in general. It gauges milk density to assess its composition. Specific gravity is the ratio of a substance's density to the density of a reference substance, usually water. The lactometer is specific to assessing milk density, not that of all liquids.
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