What does aerometer mean?
An aerometer is a scientific instrument designed to measure the weight, density, or specific gravity of air or other gases. The name combines the Greek roots 'aero-' (air) and '-meter' (measure), placing it in the same family as the barometer, thermometer, and hydrometer. In practice, an aerometer allows scientists and engineers to determine how heavy a given volume of gas is relative to a standard, information that is essential in fields such as meteorology, chemistry, and ballooning, where gas density directly affects buoyancy and behavior. Historically, various designs were employed, including instruments that weighed a measured volume of gas against an equal volume of air. Today the word is relatively rare, having been largely supplanted by more precise terms like 'densitometer' or 'gas density meter', but it remains a useful reminder of the classical Greek tradition of naming measuring devices. It appears chiefly in technical writing, historical accounts of science, and dictionaries of scientific instruments.
nounAn instrument for measuring the weight, density, or specific gravity of air or other gases.
- An instrument used to measure the weight, density, or specific gravity of air or another gas.
"The technician calibrated the aerometer before recording the density of the compressed gas."
"Using an aerometer, the laboratory determined that the sample gas was noticeably denser than ambient air."
"Early balloonists relied on the aerometer to estimate how much lift their hydrogen would provide at altitude."
Regular plural; used when referring to multiple instruments or different historical designs.
"Museums of science display several nineteenth-century aerometers alongside early barometers and hydrometers."
The '-meter' in aerometer doesn't mean 'measuring distance' — it's the Greek 'metron', measure, which is why it shares its ending with thermometers, barometers, and even speedometers.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aerometer
The word aerometer derives from the Greek elements 'aēr' meaning air and 'metron' meaning measure, joined in the pattern typical of scientific instrument names coined in European languages from the early modern period onward. It belongs to the same productive family as barometer, thermometer, and hydrometer, all built on the '-meter' suffix for measuring devices. Cognate formations using the same 'aero-' root include aerodynamics, aerosol, and aeronautics.
How aerometer is actually used
A technical and somewhat rare term, found mainly in older scientific literature and specialized instrumentation contexts; modern usage often prefers more specific terms such as 'densitometer' or 'gas density meter'.
Easily confused with aerometer
A barometer measures atmospheric pressure, whereas an aerometer measures the weight or density of air or gases.
A hydrometer measures the specific gravity of liquids, while an aerometer performs the equivalent measurement for gases.