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Hydrometer is an instrument, which is used for measuring and analyzing the specific gravity of liquids. The method to analyze the gravity of the liquid hydrometer has a weight with a vertical scale attached, when placed into a liquid, the hydrometer bobs upright, and sinks to a certain level or in simpler words the hydrometer floats depends on the density of the liquid. The specific gravity or solution composition can be read from the liquid level on the vertical scale. Hydrometers have many uses; wine, beer, and a mead maker in determining the alcohol content of a homemade beverage most commonly use it. Hydrometers are also used to test batteries by measuring the percentage of sulfuric acid in the battery electrolyte in terms of specific gravity. Thus it has many other uses. There are different types of hydrometers, which are used for different industrial and commercial purposes. Commercial hydrometers are normally adjusted for the ordinary room temperature that is 20°c (68°f) or 4°c (39.2°f). In order to utilize the hydrometer for automobile batteries a small commercial hydrometer with a glass tube enables the solution to be tested and drawn by the action of the rubber bulb. Hydrometer is commonly used equipment by the dairy farmers who use it to measure the cream content in milk, auto mechanics use it to check battery acid and radiator fluids, marine scientists to measure salinity, and breweries use it to measure alcohol content. Thus hydrometer is a very essential instrument on both commercial as well as industrial basis.
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