Also known as areometer
thumb|upright=0.65|Schematic drawing of a hydrometer. The lower the density of the fluid, the deeper the weighted float B sinks. The depth is read off the scale A.
A hydrometer is a simple instrument that measures the density of liquids by using a weighted float that sinks deeper or rises higher depending on how dense the fluid is. It matters because it allows people to quickly determine a liquid's density by reading a scale, which is useful in applications like brewing, winemaking, and other processes where liquid density indicates important properties.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).