An instrument that measures the density of a substance, typically liquids.
From Latin 'densus' (dense/thick) combined with Greek '-meter' (from metron, meaning measure). Created in the 19th century as scientists needed precise tools to measure how much mass is packed into a given volume.
Densimeters come in different types—some are simple hydrometers that float in liquids showing density by how deep they sink, while others use sophisticated physics to measure density with extreme precision in laboratories.
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