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Deciphering Vacuum Gauge Readings

Other than assembly instructions for Ikea furniture, there is little in life more confusing than high vacuum measurement. Some people speak of ‘inches of vacuum’, others use words like ‘Torr’ or ‘Microns’. Here is how it works: Mercury in a “perfect” manometer is pushed up by atmospheric air to 760mm. This is Atmospheric Pressure (1 … Read more

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