Answer :
Final answer:
A hydrometer is an instrument used for measuring the specific density of liquids based on the concept of buoyancy. It measures the amount of moisture in a gas stream.
Explanation:
A hydrometer is an instrument used for measuring the specific density of liquids based on the concept of buoyancy. It falls under the subject of instrumentation as it is used to measure a specific property of a substance. In this case, the hydrometer measures the amount of moisture in a gas stream. The hydrometer works by floating in the liquid being measured, and the point where the surface of the liquid touches the stem of the hydrometer correlates to relative density.
