![]() ![]() ![]() In SI units, 1 psi is approximately equal to 6895 Pa. In fact, to convert PSIA to PSIG, just add the current atmospheric pressure. It is the pressure resulting from a force of one pound-force applied to an area of one square inch. Thus, PSIG includes atmospheric pressure. Put the regulator back on the tank and the pressure gauge will still read 0 PSIG, even though there is 14.7 PSIA of pressure from the atmosphere. Generally speaking, it is the unit of measure inside a chamber containing gas. Atmospheric pressure is essentially the weight of the big blanket of air that extends up to the outer atmosphere, which, at sea level, exerts a force of 14.7 PSIA. With the pressure gauge removed, the hole allows the tank to equalize with atmospheric pressure. Let’s assume that our tank is at sea level. If you were to take the pressure gauge off of the tank at that reading, you would create an opening from which air would neither escape nor enter. Imagine that you have a tank of air with a pressure gauge that reads 0 PSI. The difference between PSIA and PSIG is atmospheric pressure itself. To understand what exactly would happen to a diver in this bleak situation, the TV show hosts Jessi Combs, Kari Byron, Tory Belleci, and Grant Imahara conducted a science experiment for episode 19. The basic formula for pressure is F/A (Force per unit area). ![]() When the subject is atmospheric pressure or pressure readings that are affected by atmospheric pressure, such as a balloon or an inflatable bicycle tire, this is known as “PSIA”, where the “A” stands for “absolute”. Pressure is defined as the physical force exerted on an object. The technical term for this reading is “PSIG”, where the “G” stands for “gauge”. Physics and the other sciences haven't always been such sticklers for accurately naming phenomena, both because they didn't care about rigor as much and because they didn't know better. We use “PSI” in reference to tank pressure, i.e. 6 Answers Sorted by: 2 'Bite force' is just one of many anachronism that pop up in science when you look for them. What it expresses is the number of pounds of force applied to an area of one square inch. This is an absolute sensor to which 14.7 PSI offset has been included to account for air pressure. In our literature, you’ll often see the abbreviation “PSI”, which stands for “Pounds per Square Inch” or, more precisely, “Pound force per Square Inch”. We also offers a PSIS (sealed gauge) pressure sensor. ![]()
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