What is a Material Mass Flow Meter?

• A. Measures the volume flow rate of a liquid
• B. Measures the actual mass of a flowing liquid
• C. Measures the temperature of a liquid
• D. Measures the density of a liquid

Answer: (B)

Mass flow is the amount of material passing through a section per unit time by its weight. A Material Mass Flow Meter is designed to measure how much mass of liquid is flowing each second, giving you a mass flow rate (for example, kg/s). This matters because mass flow remains consistent even if density changes due to temperature, pressure, or composition, whereas volume flow can vary with density. Devices that measure volume flow rate, temperature, or density are different kinds of instruments: volumetric flow meters track liters per second, temperature sensors read heat, and density meters determine mass per volume. So the best answer is the one that directly reports the actual mass flowing per unit time.