Refer to the image in Fig. At sea level, the above equation can be written as. If the measured pressure is not affected by the changes in atmospheric pressure then you should use PSIG or gauge pressure. Some typical applications are for measuring pneumatic pressure, hydraulic pressure, or the level of liquid in an open tank, etc. On the other hand, if the atmospheric pressure affects the measured pressure then you should go for measuring absolute pressure or PSIA.
For example, To measure pressure in a closed system or closed container, To measure the atmospheric pressure weather prediction , To assess altitude in aeronautical applications, you should use an absolute pressure gauge to measure PSIA. A vacuum is defined as a partially exhausted space. Vacuum pressure is defined and measured relative to the ambient atmospheric pressure. Usually, air pumps are used to remove air from a confined space and thus to create a vacuum.
We learned that 1 atmosphere is roughly So, if the atmospheric air is removed from the space the pressure will fall below Have a question on any of the above? Reach out to our compressed air experts at www. Only see the articles on the blog you are interested in reading. Personalize your experience by selecting the topics you are interested in below.
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