Rotameter is a device used to measure A. absolute pressure B. velocity of fluid C. flow D. rotation

The correct answer is C. flow.

A rotameter is a variable-area flowmeter used to measure the flow rate of a liquid or gas. It consists of a tapered tube with a float inside. The

The other options are incorrect because:

• A. absolute pressure is the pressure of a fluid relative to a perfect vacuum.
• B. velocity is the rate of change of position of an object.
• D. rotation is the circular movement of an object around an axis.