The NIST Reference on Constants, Units and Uncertainty

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Links to on-line unit conversions

Because we are frequently asked about on-line unit conversions, we provide links for the convenience of users to several non-NIST sources. Under no circumstances does NIST endorse or warrant their values. Official values of conversion factors are available in the Appendix of NIST Special Publication 811 in html or pdf form. This document is also available free of charge by mail.

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