What type of measurement does a rotameter provide?

A rotameter provides a flow measurement, which is its primary function. It is a type of flowmeter that consists of a tapered tube and a float. As fluid passes through the tapered tube, the flow rate causes the float to rise to a point where the weight of the float is balanced by the upward force of the fluid. The position of the float within the tapered tube corresponds to a specific flow rate, which can be read directly on a scale usually marked on the rotameter itself.

Understanding that a rotameter is designed specifically to measure the flow of liquids or gases highlights why it falls under flow measurement rather than other types. Pressure measurement involves assessing the force exerted by a fluid, while temperature measurement refers to the degree of heat present in the fluid. Volume measurement deals with the total amount of fluid rather than the rate at which it moves. Hence, the function of a rotameter aligns clearly with flow measurement, making it the correct choice in this context.