A hydrometer is a device designed to measure the relative density or specific gravity of a liquid. The measured liquids of this type by using this special measuring instrument will be known density ratio with water density.
These measuring instruments are generally made of quality glass and consist of several parts such as ball weights that are equipped with mercury fluid and cylindrical rods. In the hydrometer bar section, there is a series of scales in which this scale is used as a pointer of the size of the liquid being measured. Given the scale on this cylinder rod, the liquid can be readily readable by its type. We can read the scale directly.
A hydrometer is very useful because it can be used to measure various types of liquids that do want to know the type and density of water. For example, the milk liquid that will be measured density will be known easily and instantly only by using this gauge.
In addition to measuring the density of milk, with this tool, it will be known easily the level of sugar density mixed in the milk liquid. Examples of other liquids that can be measured using this hydrometer are alcoholic beverages. Easily and quickly, the alcohol content in a brand of alcoholic beverages can be read, whether the alcohol content is low or high.
The working principle of the hydrometer that applies Archimedes Law itself is actually often found in our daily lives. The law of Archimedes itself emphasizes the following statement: objects entering or immersed in a fluid (liquid, gas, and not solid) will obtain a thrust force with an upward direction equal to the density of the fluid. Thus, when the hydrometer is inserted into a liquid, the liquid returns to give an upward force of the same amount as the transferred liquid.