| 45 | | == IMPORTANT SPECIAL RELEASE NOTE == |
| 46 | | |
| 47 | | Version 1.6, November 2005 |
| 48 | | |
| 49 | | Ever since we changed the internal maintenance of The Unified Code for Units of Measure to XML (which happened after release 1.4 in May of 2002) the definition of some units that used exponential notation for the magnitude was incorrect. A systematic text-conversion error had caused the minus sign and the first digit of all exponents to be deleted. This mostly affected natural constants, such as parsec, proton mass, electron charge, Boltzman's constant, and all units that are defined based on these. Fortunately these units are rather rare in everyday use in trade and medicine, however, we must urge everyone to regenerate their tables, dictionaries, and knowledge bases, and check their data immediately based on this corrected release of The Unified Code for Units of Measure. |
| 50 | | |
| 51 | | The units directly affected by this error were: unified atomic mass unit (u), parsec (pc), Planck's constant [h], Boltzman's constant [k], electric permittivity ([eps_0]), elementary charge ([e]), electron mass ([m_e]), proton mass ([m_p]), Newton's constant of gravitation ([G]), Maxwell (Mx), Gauss (G), phot (ph), Curie (Ci), Roentgen (R), and U.S. and international mil ([mil_i], [mil_us]). |
| 52 | | |
| 53 | | Because these units were used in some (though not many) definitions of other units, the indirectly affected units are: electron volt (eV), and circular mil ([cml_i]). |
| 54 | | |
