In SI units, pressure above atmospheric pressure is primarily measured in ____.

In SI units, pressure above atmospheric pressure is primarily measured in kilopascals. The pascal (Pa) is the SI unit of pressure, equivalent to one newton per square meter. A kilopascal is equal to 1,000 pascals and is a common unit used in various applications, including heating, ventilation, and air conditioning (HVAC).

In HVAC contexts, it is essential to express pressures in a unit that aligns with the SI measurement system, making kilopascals the standard for ease of calculation and consistency across scientific and engineering disciplines. While other units, such as millibars, torr, and microns, are used in specific contexts or older systems, kilopascals are widely accepted for measuring pressures in relation to atmospheric pressure, particularly in modern scientific and engineering practices.