What does a manometer measure?

A manometer is an instrument specifically designed to measure pressure, typically in gases or liquids. It operates by comparing the pressure of the fluid in question to a reference pressure, which is often atmospheric pressure. The functioning principle involves a column of liquid, usually mercury or water, where changes in pressure cause the liquid to rise or fall, indicating the pressure level being measured.

In contexts like HVAC systems, laboratory settings, and various industrial applications, knowing the pressure is crucial for ensuring systems operate within safe and efficient parameters. Therefore, the primary role of a manometer is to provide accurate pressure readings, making it essential for tasks that involve fluid dynamics and various mechanical processes.

The other choices—temperature, mass, and volume—do not pertain to the function of a manometer. Instruments like thermometers would be used for temperature measurement, scales for mass, and graduated cylinders for volume, each serving its unique purpose in various scientific and practical applications.