Here's how it works:
* Hydrometer Design: A hydrometer is a sealed glass tube with a weighted bulb at the bottom and a graduated stem at the top.
* Principle of Floatation: The hydrometer floats in the liquid, and the depth to which it sinks indicates the liquid's specific gravity.
* Specific Gravity Measurement: The scale on the stem is calibrated to directly read the specific gravity of the liquid. A higher specific gravity means the liquid is denser and the hydrometer will sink less.
Note: There are different types of hydrometers designed for specific liquids (e.g., battery acid hydrometer, wine hydrometer).
