# How to Find Absolute Pressure?

The total pressure, or absolute pressure, is thus the sum of gauge pressure and atmospheric pressure:pabs=pg+patm p abs = p g + p atm wherepabs is absolute pressure,pg is gauge pressure, andpatm is atmospheric pressure.

## How to Find Absolute Pressure?

Finding absolute pressure is crucial when measuring atmospheric pressure, as it is the only way to accurately measure the “true” pressure. Absolute pressure is the pressure measured relative to a perfect vacuum, and is the most widely accepted measure of atmospheric pressure. To find absolute pressure, one must first understand two important concepts: barometric pressure and gauge pressure.

Barometric pressure is the atmospheric pressure measured at a certain location and is measured relative to a perfect vacuum. The barometric pressure varies with elevation and will be different depending on the location of measurement. This type of pressure is also referred to as “atmospheric pressure” or “ambient pressure” and is the most widely used measure of atmospheric pressure.

Gauge pressure, on the other hand, is the pressure measured relative to the atmospheric pressure. It is typically measured with a pressure gauge and is the most common method of measuring pressure. This type of pressure is often used in industries such as HVAC and automotive to measure the pressure inside a system.

Now that the two main types of pressure have been identified, it is important to understand how they are used to find absolute pressure. To measure absolute pressure, one must first measure the barometric