Reasons to be careful
On 02/27/2016 8:17 AM, dpb wrote:
....
... Negative is then vacuum, positive is
pressure like 28 psi for tires is 28 psig(auge) or 28 psi _above_
atmospheric.
Or, when in "inches (mm) vacuum" then the negative sign is discarded but
numeric value is same of course.
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