Positive Vs Negative Pressure, What is the Difference?

Pressure measurement is an indispensable monitoring content in the fields of process control, industrial production and manufacturing. Pressure data can help us find problems in time and avoid safety accidents caused by abnormal pressure. In pressure measurement, positive pressure and negative pressure are relative concepts. In this article, we will introduce the concepts of positive pressure and negative pressure to you so that you can better understand pressure.

Positive pressure

Positive pressure refers to the pressure value of atmospheric pressure at that time, and also refers to the positive gauge pressure value. The formula is: P positive pressure = P ab-P atm. Positive pressure measurement is used in oil, natural gas and chemical pipelines, chemical reaction vessels and other closed equipment, energy and power systems, ventilator equipment and other medical pressure monitoring.

Negative pressure

Negative pressure refers to the pressure value lower than atmospheric pressure, which can also be called vacuum pressure. The formula is: Pnegative pressure = Patm-Pab. Negative pressure can be effectively used in the medical industry, such as chest drainage, negative pressure wound treatment, industrial and manufacturing industries such as vacuum packaging, vacuum distillation, vacuum coating, etc., construction and environmental engineering, energy and power systems, etc.

Positive Vs Negative pressure

Positive pressure and negative pressure are values relative to atmospheric pressure, where the pressure value of atmospheric pressure is called positive pressure, and the value below atmospheric pressure is called negative pressure. Atmospheric pressure values vary due to regional differences. Therefore, the positive and negative pressure values under standard atmospheric pressure may have different pressure values in different places. The fluid in a positive pressure state flows from the inside of the system to the outside, while the fluid in a negative pressure state flows from the outside to the inside. In short, in practical applications, we should choose the appropriate pressure type according to our applications.

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