Which component rises and falls with changes in liquid level?

The magnetic float is a component that operates on the principle of buoyancy and is commonly used in liquid level measurement applications. As the liquid level rises or falls, the float moves vertically with it. This movement is typically used to activate a switch or to send a signal to a monitoring system, indicating the level of the liquid.

A magnetic float often contains a magnet that can trigger a reed switch as it passes by, allowing for the detection of different liquid levels. The simplicity and reliability of this mechanism make it a popular choice for applications such as water tanks, fuel storage, and other vessels where liquid levels need to be monitored.

Other options, such as pneumatic floats, capacitance sensors, and ultrasonic level transducers, operate on different principles and do not simply rise and fall with liquid levels in the same manner as a magnetic float. For instance, while pneumatic floats may also measure liquid levels, they utilize air pressure and are not dependent on the direct movement of a float in the same way. Capacitance sensors and ultrasonic transducers rely on changes in electrical capacitance or sound waves, respectively, rather than physical movement tied directly to liquid level fluctuations.