Aneroid

An aneroid is a device that is used to measure air pressure. It consists of two main parts: an aneroid box and a dial indicator.

An aneroid box is a sealed container containing a sensing element. This element can be made of various materials such as rubber, plastic or metal. When the air pressure inside the box changes, the sensing element reacts and changes its shape.

The dial indicator is located on the outside of the aneroid. It shows the current air pressure value as an arrow on the scale. The scale can be graduated in different units such as millimeters of mercury (mmHg), kilopascals (kPa) or hectopascals (hPa).

The operating principle of an aneroid is based on Pascal's law, which states that pressure exerted on a liquid or gas is transmitted equally in all directions. Thus, when the air pressure inside the aneroid box changes, it is transmitted to the sensing element, which then affects the dial indicator.

Aneroid is widely used in various fields including meteorology, hydrology, geology and others. For example, aneroids are used to measure atmospheric pressure in weather stations. They can also be used to measure water levels in rivers and lakes.

In conclusion, it can be said that aneroid is an important instrument for measuring air pressure and is widely used in various fields of science and technology.