Why hydrometer has a narrow tube?
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A hydrometer usually consists of a sealed hollow glass tube with a wider bottom portion for buoyancy, a ballast such as lead or mercury for stability, and a narrow stem with graduations for measuring. ... The point at which the surface of the liquid touches the stem of the hydrometer correlates to relative density.
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yes hydrometer has a narrow tube which allows water to pass through it which generates electricity
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