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Originally Posted by KenWittlief
OK, you got some splaining to do. Air pressure at sea level is 15 lbs / sq"
a perfect vacuum is 0 lbs / sq"
what exactly is negative pressure ?!
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If you use ambient pressure as a reference, you can measure down to -15 PSI.
To get 1000 pounds of negative pressure out of a total vacuum, you need more than 65 square inches of suction plate, as long as the other side of the plate is open to the outside air. You can do it with a square foot using only a 7 PSI vacuum source.