When you’re working with projects involving vacuum pumps, vacuum gauges will show you the pressure in the chamber being evacuated. There are many different approaches to measuring the pressure in a vacuum, but we’ll focus on one of the most common, called the Bourdon pressure gauge.
At the heart of the Bourdon gauge is a C-shaped flattened tube that is connected to the chamber being evacuated. The removal of the air in the tube causes the tube to bend slightly, which moves a mechanism attached to the end of the tube. This mechanism amplifies and converts the bending motion into rotation, moving the pressure dial to indicate the pressure in the tube.
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Although the chart is informative, it’s misleading. The main problem is that the “zero” value is placed incorrectly on the chart. If you absolutely needed to put a zero on the chart (which really isn’t needed), it should go to the extreme left of the x-axis. This is because a true zero (absolute) vacuum, which doesn’t exist, is lower than ANY other value shown on the chart.
Good catch! I’ll fix that mistake and re-upload the image. Thanks for letting us know!
My pleasure, glad to help.
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