In the case of a hydrometer for heavier liquids, why is the lowest value of lowest density marked near the top of the stem and the highest density near the bottom of the stem?

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Solution

The reason for marking the lowest density at the top of the stem and the highest density at the bottom of the stem in the case of a hydrometer for heavier liquids is discussed below:
When a hydrometer for heavier liquids is immersed in water, most of its stem gets immersed in the water because the lightest density corresponds to water.
When a hydrometer for heavier liquids is immersed in a denser liquid, a lesser length of the stem gets immersed in the denser fluid and therefore, heavier densities are marked below the density of water to take the readings quite comfortably.

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