It was published in 1960 but has a very long history even before that. SI system is the world’s most widely used system of measurement. Now that I mentioned the metric system, I can already see some of you taking a step back… but please stay with me! Let’s start to look at the pressure units by looking at the SI system, which is the International System of Units, derived from the metric system. International System of Units (SI system) / Metric Similarly, pound-force per square inch (pfsi) is normally indicated as pounds per square inch (psi).ĭownload this article as a free pdf by clicking the picture below: For example, pressure unit kilogram-force per square centimeter should be indicated as kgf/cm², but often it is indicated just as kg/cm² without the “f ”. It is good to notice that in practice the “force” is not always included in the pressure unit names. Plus there are also a lot of pressure units that do not directly have the mass and area in their names, although it often is in their definition. As there are so many different engineering units used for both mass and area, the number of combinations of these is huge. When we look at force, it is specified as being Mass x Gravity. So what does this force per area mean in practice? It means that there is a certain force affecting a specified area. The pressure is indicated with the letter “p”, although the capital letter “P” can also be seen being used on some occasions. That is often presented as formula p = F/A. ![]() If you remember the studies of physics in school … as most of us don’t remember… a short reminder is in order: pressure is defined as force per area perpendicular to the surface. It is good to first take a quick look at the definition of pressure, this will also help to better understand some of the pressure units. ![]() When I talk about pressure in this post, it does not refer to the stress you may be suffering in your work, but to the physical quantity.
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