A level is a measuring tool that uses the principle of keeping the liquid level level when it is stationary to measure the inclination or verticality of the surface being measured. The following is a detailed introduction to the level:

The working principle of a spirit level

The level is filled with liquid and bubbles inside. When the level is kept horizontal, the bubbles will stay in the middle position because when the liquid is stationary, it will automatically search for the lowest energy state, which is the horizontal state. If the level is tilted, the bubbles will move to the higher side of the liquid, indicating the current angle of the level.

The composition of a horizontal ruler

A horizontal ruler usually consists of a ruler body and a set of level bubbles, which contain a liquid, such as water or alcohol, with a bubble in the liquid. The ruler body is made of metal, plastic, and new materials such as magnesium aluminum alloy, which are more popular due to their lightweight and bending resistance.