An instrument that measures the density or specific gravity of liquids, similar to a hydrometer.
From Greek 'araios' (rare or thin, relating to specific gravity) and 'metron' (measure). This scientific instrument term emerged in the 18th century as chemists needed precise tools for measuring liquid properties.
An araeometer floats at different levels depending on a liquid's density—breweries and wineries use these to predict alcohol content before fermentation even finishes! It's basically predicting the future using floating physics.
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