Gauge Pressure vs Absolute Pressure – Know the Difference! Pressure measurement is one of the most important concepts in instrumentation, and understanding the difference between Gauge Pressure and Absolute Pressure is essential for every engineer and technician. Gauge Pressure is measured relative to atmospheric pressure, which is why most industrial pressure gauges display 0 bar when open to the atmosphere. It is commonly used in process industries, compressors, pumps, pipelines, and hydraulic systems. Absolute Pressure, on the other hand, is measured relative to a perfect vacuum (0 absolute pressure). It is always a positive value and is widely used in vacuum systems, aerospace, scientific research, and high-precision process applications. The relationship between the two is simple: Absolute Pressure = Gauge Pressure + Atmospheric Pressure This infographic provides a quick comparison of their reference points, equations, applications, and key characteristics, making it easy to understand when each type should be used. Save this post for future reference and share it with your fellow engineers and students. Post navigation PRESSURE REDUCING ASSEMBLY: Orifice Plate Types Explained – A Quick Guide for Instrumentation Engineers!
