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What is the difference between vacuum and absolute pressure

Often you will see a measurement of vacuum pressure described as an absolute pressure reading, so is there any difference between the two?

A vacuum pressure is one that is lower than the ambient environment surrounding pressure, and is typically measured relative to a perfect vacuum or full vacuum.

Since the reference pressure is not relative to another pressure and does not change, it is called the absolute reference or absolute pressure reference.

Vacuum measurement products
  • 1 bar vacuum gauge and sensor with USB plus Labview driver
  • Negative room pressure monitor and logger for multiple zones
  • 0 to -300 mmH2O vacuum transmitter
  • DS200P Sanitary Low Range Pressure Gauge, Switch and Sensor

Any pressure measured relative to a full vacuum, whether above or below the surrounding ambient air pressure, is called an absolute pressure.

A vacuum pressure can always be measured and defined as an absolute pressure, but an absolute pressure can also be used to define pressures outside the vacuum range.

What is the difference between vacuum and absolute pressure
Absolute pressure measurement products
  • DMP333 High Range Precision Pressure Transmitter
  • 2 bar absolute range 4 -20 mA output submersible silicon diaphragm liquid level sensor
  • 500-1100 mbar absolute range 0-5 volts output barometric pressure sensor
  • Vacuum logger to measure 0 to -1 bar suction or 0 to 1 bar absolute

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