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Official values of conversion factors
can be found in the ISO Standards Handbook 31 – Quantities and units, which can be purchased from the usual ISO outlets;
may also be consulted on-line in Appendix B of NIST Special Publication 811 (PDF format). |
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The CODATA internationally recommended values for the fundamental physical constants are available from the NIST site. |
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Several on-line unit conversion facilities exist, and links to a number of these are provided by the NIST. The BIPM has no plans to develop its own on-line conversion programs. |
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