Certified Respiratory Therapist Practice Exam

Which type of manometer is suitable for measuring atmospheric pressure?

1. Fluid column pressure manometer

2. Digital pressure gauge

3. Mechanical pressure manometer

4. Bourdon gauge

The correct answer is: Fluid column pressure manometer

A fluid column pressure manometer is suitable for measuring atmospheric pressure because it operates based on the height of a liquid column to indicate pressure differences. This type of manometer utilizes the weight of the fluid in the column, allowing for a direct measurement of the pressure exerted on the liquid's surface. When measuring atmospheric pressure, the fluid column will rise or fall to reflect changes in the surrounding atmospheric pressure, providing a reliable and accurate reading. In contrast, a digital pressure gauge, mechanical pressure manometer, and Bourdon gauge are all designed for measuring various types of pressure but may not be ideally suited for atmospheric pressure measurements. Digital pressure gauges are typically more specific to certain ranges of pressures and may not measure atmospheric pressure as accurately as a fluid column manometer. Mechanical pressure manometers often have limitations in measurement range depending on their design, and Bourdon gauges, while widely used for many pressure measurements, are generally more suited for contained or pressurized systems rather than direct indication of atmospheric pressure. Thus, the fluid column pressure manometer stands out for accurately measuring atmospheric pressure.