Re: HO Tank Car Lid


Jack Mullen
 

On Mon, Nov 23, 2020 at 02:47 PM, Tony Thompson wrote:
They pulled a higher vacuum with a vacuum truck. Those are usually used for sucking out clogged sewer pipes and the like and obviously exceed “full” vacuum (14.5 psig). I don’t know HOW it works, tho.
I hope this is meant as a joke that's too subtle for me to get. There isn't any vacuum that exceeds full vacuum, which is 0 psia. No matter how you pump, you don't get less than nothing, because you can't remove more than everything.

Jack Mullen

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