Re: HO Tank Car Lid
Claus Schlund \(HGM\)
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Hi Ed and List Members,
That was subtle Ed, very subtle...
What Ed is trying to say is that normal atmospheric pressure is about 14.7 PSI.
Thus a PERFECT VACUUM would read at -14.7 PSI (note the minus sign).
Therefore, a "vacuum at -27psi" is not possible under any circumstance on earth