What is the term for pressure measured with a base of zero?

The correct term for pressure measured with a base of zero is absolute pressure. Absolute pressure refers to the total pressure of a system, including atmospheric pressure, and is measured relative to a perfect vacuum, where the pressure is considered to be zero. This measurement is crucial in various applications, particularly in scientific and engineering fields, where precise pressure readings are necessary for calculations and system designs.

In contrast, gauge pressure measures pressure relative to atmospheric pressure, meaning it accounts for the ambient pressure. Therefore, when gauge pressure is indicated, it can sometimes read as zero when the pressure is the same as atmospheric pressure, but it will not provide the total pressure if a vacuum is not considered.

Relative pressure is often used to describe pressure in specific applications but does not denote a standardized reference point like absolute pressure does. Dynamic pressure is related to the movement of a fluid and is not applicable in this context of pressure measurement.

Understanding absolute pressure is essential in various scientific calculations, ensuring that all values are measured from a consistent reference point, which is crucial for maintaining accuracy across different systems and applications.