Mpsi
million pounds per square inch
Pressureexact by definition
The million pounds per square inch, written Mpsi, is exactly 6.894757293168361 gigapascals. It exists only for elastic moduli, which are the one quantity in customary units too large for ksi: steel is 29 to 30 Mpsi, aluminium about 10, and carbon fibre along the fibre 30 to 60.
Watch out: Mpsi is not "megapsi" in the SI sense of the prefix meaning 10⁶ applied to a coherent unit, but the numerical value is the same, so no harm comes of reading it that way. Do not read it as MPa: the two differ by a factor of about 6895.
| 1 Mpsi | 6,894,757.3 kPa |
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