Which device typically uses a float for determining liquid level?

A level switch typically uses a float to determine liquid level because it is designed specifically to monitor and control the level of liquids in a tank or container. The float rises and falls with the liquid's level, allowing the switch to detect whether the liquid is at a certain point, which can then trigger actions such as activating pumps or alarms. This technology is widely used in various applications, making it an effective and reliable means of level measurement.

The reason other devices are not correct involves their primary functions. A pressure gauge measures the pressure of a fluid within a system and does not utilize floats for this measurement. A flow meter is used to determine the flow rate or quantity of a liquid moving through a system, often employing different methods such as turbine or electromagnetic sensing. A thermometer is designed to measure temperature, and while it can be used in liquid environments, it does not use a float mechanism for its operation. Each of these devices has distinct functions that do not involve direct level measurement using floats, further emphasizing why the level switch is the appropriate choice.