Hydrometers can be made of many, various substances.
Brewers hydrometers used professionally, are made of brass.
Ones used for aquariums have been made of plastic.
The popular, general purpose, kind used in laboratories, would probably be made of glass.
Glass is cheap and easy to be made and does not react with many chemicals.
Salinometer
Mrs.Tuft used a hydrometer to determine the specific gravity of a liquid
Barometer is used to measure atmospheric pressure. Hydrometer is used to measure specific gravity.
The Greek scholar Hypatia of Alexandria is credited with inventing the hydrometer in the late fourth or early fifth century.
An alcoholometer is a hydrometer used to measure the amount of alcohol in a liquid, such as beer.
Hydrometer measure the density of liquids.
It measured by the density of the size from the hydrometer.
Salinometer
The hydroscope (also called the hydrometer) is thought to be invented by Hypatia of Alexandria. If this is true, the first hydroscope was invented in the 4th century.
A hydrometer is used to find the specific gravity (or relative density) of liquids.
a hydrometer checks the state of battery charge using specific gravity.
Mrs.Tuft used a hydrometer to determine the specific gravity of a liquid
a mathimatical term called a unit of hydrometer is what the study of gravity and other measurements
Hydrometer
it is liquid
A thermohydrometer is actually a regular hydrometer that has a thermometer inside the float section. It is very similar to the regular hydrometer.
hydrometer s used to check the acid in a dog's body