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Hydrometer vs. Areometer

Hydrometer and Areometer Definitions

Hydrometer

An instrument used to determine specific gravity, especially a sealed, graduated tube, weighted at one end, that sinks in a fluid to a depth used as a measure of the fluid's specific gravity.

Areometer

Any device used to measure the specific gravity of liquids or the density of solids.

Hydrometer

An instrument that floats in a liquid and measures its specific gravity on a scale.

Areometer

An instrument for measuring the specific gravity of fluids; a form hydrometer.

Hydrometer

An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc.

Hydrometer

An instrument, variously constructed, used for measuring the velocity or discharge of water, as in rivers, from reservoirs, etc., and called by various specific names according to its construction or use, as tachometer, rheometer, hydrometer, pendulum, etc.; a current gauge.
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Hydrometer

A measuring instrument for determining the specific gravity of a liquid or solid

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