>> Who the **** says "pounds psi"?
> 
> Someone talking to an audience that doesn't know what "psi" means?

Then why not just write "pounds per square inch"? Or just "PSI"? If you 
don't know what it means, adding "pounds" doesn't really help.

> What's the metric unit of pressure like this, out of curiousity?

x Pascals = x Newtons/square meter.

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