Float (liquid level)
Encyclopedia
Liquid level floats, also known as float balls, are spherical, cylindrical, oblong or similarly-shaped objects, made from either rigid or flexible material, that are buoyant in water and other liquids. They are non-electrical hardware frequently used as visual sight-indicators for surface demarcation
Demarcation
Demarcation is the act of creating a boundary around a place or thing.Demarcation may also refer to:*Demarcation line, a temporary border between the countries...

and level measurement. They may also be incorporated into switch mechanisms or translucent fluid-tubes as a component in monitoring or controlling liquid level.

Liquid level floats use the principle of material buoyancy (differential densities) to follow fluid levels. Solid floats are often made of plastics with a density less than water or other application liquid, and so they float. Hollow floats filled with air are much less dense than water or other liquids, and are appropriate for some applications.
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