Hydrometer vs. Aerometer

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.

Aerometernoun

An instrument used to measure the mass and density of gases.

Aerometernoun

An instrument for ascertaining the weight or density of air and gases.

Aerometer

An aerometer is an instrument designed to measure the density (among other parameters) of the air and some gases.The word aerometer (or Ärometer, from Ancient Greek ἀήρ -aer and μέτρον -métron ) refers to various types of devices for measuring or handling of gases. The instruments designated with this name can be used to find: the density, the flow, the amount or some other parameter of the air or a determined gas.Several different designs of aerometer have been developed for the study of speech.