Question

Why does a hydrometer have a narrow stem

Answer 1

the hydrometer have narrow stem because it sinks to a greater depth and the graduation are well spaced and the narrowness increases it's sensitivity and at the tip it contains lead.

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Answer 2

Hydrometer has a narrow stem at the bottom which carry lead . It is so because the hydrometer balances its own weight without tilting by the lead concentration towards its centre .