You don't need to. It already says on the bottle.
by how it floats
It measured by the density of the size from the hydrometer.
The calculated specific gravity may be slightly different than the hydrometer reading. The calculated gravity is calculated using specific data while the hydrometer measures the liquid at a specific time and temperature.
A hydrometer consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float upright. Mercury has a higher density, thus a lower volume for the same weight than lead. It is a toxic liquid metal, but also more dangerous and difficult to clear up the mess when a glass hydrometer is broken
A saccharometer is a hydrometer used to measure the sugar content of a liquid.
Yes, we can use hydrometer to measure the density of milk. Explanation Hydrometer is a device which is used to measure the density of a liquid. Hydrometers are calibrated for different uses, such as a lactometer for measuring the density (creaminess) of milk, a saccharometer for measuring the density of sugar in a liquid, or an alcoholometer for measuring higher levels of alcohol in spirits
This type of hydrometer is used to measure the concentration of ethanol in alcoholic drinks; read the indication of the scale at the recommended temperature.
Watch this: https://www.youtube.com/watch?v=SRcOqfL6GqQ
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.
Mrs.Tuft used a hydrometer to determine the specific gravity of a liquid
a hydrometer checks the state of battery charge using specific gravity.
a mathimatical term called a unit of hydrometer is what the study of gravity and other measurements
Hydrometer
it is liquid