Hydrometer
Hydrometer
A Hydrometer (/haɪˈdrɒmɪtər/; from Ancient Greek: ὕδωρ, 'water' and μέτρον, 'measure') is an instrument used to measure the specific gravity (or 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.
History
The hydrometer dates back to the late 4th century BC, when Archimedes of Syracuse first discovered the principles of buoyancy upon which the hydrometer is based.
Usage
Hydrometers are used in various fields such as chemistry, brewing, winemaking, and the sugar industry. In medicine, they are used in urinalysis to measure the specific gravity of urine, which can be a useful diagnostic tool.
Types of Hydrometers
There are several types of hydrometers used in different applications. These include:
- Lactometer: Used to test the purity of milk by measuring its density.
- Alcoholometer: Used to measure the alcohol content in a liquid.
- Saccharometer: Used to measure the sugar content in a solution.
See Also
References
External links
- Medical encyclopedia article on Hydrometer
- Wikipedia's article - Hydrometer
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