Final answer:
A hydrometer is weighted with lead shots for stability and has a narrow stem for precise measurements of liquid density.
Explanation:
A hydrometer is weighted with lead shots for stability, ensuring it floats upright. The lead adds weight to the bulb end, preventing it from tipping over in the liquid being tested. The narrow stem of a hydrometer allows for precise measurement as small changes in liquid density can be detected easily. This design feature enables accurate readings of the specific gravity of the liquid.
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