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Well, darling, pressure gauges don't give a hoot about altitude when it comes to calibration. They just want to be accurate wherever they are. So yes, pressure gauges do need to be calibrated for altitude because atmospheric pressure changes with altitude, and if you want reliable readings, you better make sure that gauge is properly calibrated.
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Beauyes for every 5000 feet of elevation your bourdon tube type of gauge will increase by 2 psi. even though the sealed vessel you are checking remains at the same psi.
example if i have a sealed tank at sea level and it is reading 12 psi. at 5000 feet the same tank and gauge will now read 14 psi. and at 10000 feet 16 psi. the tank pressure has not changed but the gauge is now out of whack because there is less pressure pressing on the bourdon tube. less atmospheric pressure easier for the gauge to go up.
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If the parallelogram below has an area of 320 square units what is the length of the altitude shown?
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