absolute pressure

This term is a technical specification used primarily in physics, engineering, and fluid dynamics. It describes a measurement that starts from a zero point of a perfect vacuum, ensuring that the value remains consistent regardless of changes in the local environment or altitude.

It is frequently contrasted with gauge pressure, which measures the difference between the system pressure and the ambient atmospheric pressure. In practical application, failing to distinguish between these two can lead to critical errors in vacuum systems or high-altitude aviation calculations.