When I say “air,” it means the air around us, comprised of about 78% of nitrogen, 21% of oxygen, under 1 % argon and a small amount of other gases. The earth’s atmosphere above us contains air, and although it is relatively light, having that much of it, it starts to have some weight as gravity pulls the air molecules. In comparison, the common gauge pressure is referred to as current barometric/atmospheric pressure.įor more detailed information on the different pressure types, please have a look at the blog post Pressure calibration basics – Pressure types.Īs mentioned, barometric pressure is the pressure caused by the weight of the air above us. When measuring absolute pressure, the measured pressure is being compared to a perfect (absolute) vacuum, where there are no air molecules left and therefore no pressure. To learn more about pressure and the different pressure units being used, please take a look at the blog post Pressure units and pressure unit conversion.īarometric pressure is a so-called absolute pressure type. However, most pressure units don’t include this principle right in their name. For example, psiis pound-force per square inch, or kgf/cm 2 is kilogram-force per square centimeter. Whether we’ve been thinking it or not, many commonly used pressure units indicate the force and the area in their name. The International SI defines the base unit for pressure as a Pascal, where 1 Pascal equals 1 Newton per square meter (N/m2). To start with, what is pressure? Pressure is defined as force per area (p=F/A), which means that pressure is a certain amount of force affecting an area. That definition sounds pretty simple, but let’s anyhow take a deeper look into this subject… Very shortly, we can say that: Barometric pressure is the pressure on earth that is caused by the weight of the air above us. Please note that barometric pressure is sometimes also referred to as atmospheric pressure. We regularly get asked, “what is barometric pressure?” So I decided to make a short blog post to answer this.
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March 2023
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