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What is hydrometer ?...

What is hydrometer ?

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What is a hydrometer ? Name the two categories of hydrometers and explain the principle on which its working is based.

A hydrometer stem has a length 30 cm. If the hydrometer is immersed in water , its floatation bulb just sinks. If the same hydrometer is immersed in a liquid having density of 500 kg m^(-3) , two-third of the stem is immersed. Find the least specific gravity of a liquid that can be measured using the hydrometer.

A constant immersion hydrometer weighing 20 g sinks upto mark 'x' in water and this hydrometer has to weight 25 g to mark 'x' in a given liquid. Then the relative density of the liquid is ____.

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