The formula they put forward is: PSI = -17,902 + 1.516 x CUP . If you work it out by the rules, multiply then addition of the negative you come up with 27,288 PSI. So 20,000 - 26,000 is right where they place it. This is an older thread, you may not receive a response, and could be reviving an old thread. More @Wikipedia
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