Hydrometer vs. Hygrometer

Hydrometernoun

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

Hydrometernoun

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

Hydrometernoun

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.

Hydrometernoun

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

Hydrometer

A hydrometer is an instrument used for measuring the relative density of liquids based on the concept of buoyancy. They are typically calibrated and graduated with one or more scales such as specific gravity.

Hygrometernoun

(meteorology) An instrument that measures the humidity of the air or other gases, especially the relative humidity.

Hygrometernoun

An instrument for measuring the degree of moisture of the atmosphere.

Hygrometernoun

measuring instrument for measuring the relative humidity of the atmosphere

Hygrometer

A hygrometer is an instrument used to measure the amount of water vapor in air, in soil, or in confined spaces. Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass, a mechanical or electrical change in a substance as moisture is absorbed.