Hydrometer

A hydrometer is an instrument that is used to measure the density of liquids and solids. It is a tube filled with liquid and having a scale on the side surface. When a hydrometer is immersed in a liquid, its density changes depending on the density of the liquid.

The hydrometer was invented in the 18th century by the French scientist Antoine Lavoisier. He used this instrument to study the density of various liquids, including water and air.

Today, hydrometers are widely used in various fields of science and technology, such as chemistry, physics, biology and medicine. They are used to determine the concentration of solutions, determine the density of petroleum products, and also to measure the density of water in rivers and lakes.

Despite the fact that hydrometers are fairly simple devices, their use requires certain knowledge and skills. For example, to properly use a hydrometer, you need to know how to properly immerse it in a liquid and how to interpret the results.

Overall, a hydrometer is an important tool for scientific research and practical applications. It allows scientists and engineers to obtain information about the physical properties of various substances and materials, which contributes to the development of science and technology.

Hydrometer [from Greek. ary - without and metron - measure] - a device for measuring the density of a liquid, nowadays used to determine the density of motor and transmission oils.

This device is also widely used to determine the sugar content in wine materials and sort them before fermentation.

The operating principle of the device is based on measuring the mass of a liquid column. Above the surface of the liquid there is a reservoir with holes for air to pass through. It is equipped with a small scale. If the density of the liquid increases or decreases, the column will also change its volume accordingly and become shorter. Therefore, the level along which the pin moves changes. The density of the liquid can be determined by the movement of the pin.