What does a Hydrometer measure?

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Multiple Choice

What does a Hydrometer measure?

Explanation:
Hydrometers measure the density of a liquid (often expressed as specific gravity). This works because of buoyancy: the float sinks further in less dense liquids and rises higher in more dense ones. The reading on the stem corresponds to how dense the liquid is. It’s not about how much liquid is in a tank, nor about the liquid’s temperature, and it doesn’t measure gas pressure.

Hydrometers measure the density of a liquid (often expressed as specific gravity). This works because of buoyancy: the float sinks further in less dense liquids and rises higher in more dense ones. The reading on the stem corresponds to how dense the liquid is. It’s not about how much liquid is in a tank, nor about the liquid’s temperature, and it doesn’t measure gas pressure.

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