Recreational Vehicle (RV) Technician Practice Test

What type of pressure does a manometer measure?

1. Liquid pressure

2. Gas pressure

3. Atmospheric pressure

4. Vacuum pressure

The correct answer is: Gas pressure

A manometer is a device specifically designed to measure the pressure of gases. It typically uses a column of liquid to gauge the pressure exerted by a gas in a given environment. The basic principle behind a manometer is that as the pressure of the gas increases, it pushes the liquid in the manometer column higher. Conversely, if the pressure decreases, the liquid level drops. This is particularly useful in various applications including HVAC systems, laboratories, and RV systems where monitoring gas pressure is crucial for safety and functionality. While manometers can also be adapted to measure other types of pressure, the most common and traditional use is for gas pressure, making this option the most accurate choice for the question at hand. Atmospheric pressure and vacuum pressure can also be measured using manometer configurations, but those are more specialized uses and not the primary function. Liquid pressure measurements typically utilize different types of instruments, such as piezometers or pressure transducers.