Quote:
Originally Posted by KBF
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In the avoirdupois system, the units of pressure are pounds per
square inch and in the metric system, the units or pressure are newtons per
square meter (pascals). A chamber pressure measured with a copper
crusher gauge would be expressed as
psi (CUP) in the English system or MPa (CUP) in the metric system.From Wikipedia
.. Also see SAAMI chamber pressure method.