Re: This is a new one on me
KPa I believe is metric and the agreed unit under the SI. Psi is an old imperial measure. Bar is an old British measure.
At work we have all three on various systems and equipment. I guess it's a bit like the fact you can still buy a pound of strawberries at a fruit and veg market. It would be ridiculous to retrofit every single piece of equipment using the old measures.
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