How can low pressures and vacuums be measured?

The measurement of low pressures and vacuums is ideally suited for a manometer, which operates on the principle of balancing the height of a liquid column against the pressure being measured. Manometers are specifically designed to provide accurate readings of pressure, especially in low-pressure scenarios, by utilizing a liquid, such as mercury or water, that responds to pressure changes.

When measuring low pressures or vacuums, a manometer allows for a direct visual representation of pressure levels through the height of the liquid column. This is particularly effective for applications where precision is necessary and where the pressure is below atmospheric levels, making it challenging for other types of gauges.

While transducers can also measure pressure, they typically convert pressure into an electrical signal and may not provide the same level of ease and clarity in low-pressure scenarios that a manometer does. Rotameters are primarily used for measuring flow rates rather than pressure, and MPa is a unit of measure rather than a tool for measurement. Therefore, a manometer is the appropriate choice for measuring low pressures and vacuums.