ABSTRACT
The international system of units is described in detail in NIST Special Publication 811 and lists of physical constants and conversions factors. This chapter contains tables that list selected unit conversions. The conversions are presented in matrix format when all of the units are of a convenient order of magnitude. The chapter provides guidance in the use of base-ten concentration units, since there are differences in usage worldwide. It also provides some commonly used physical constants that are of value in thermodynamic and spectroscopic calculations. The chapter further provides a summary of the requirements for metric weights and mass standards commonly used in chemical analysis. The actual specifications are under the jurisdiction of ASTM Committee E-41 on General Laboratory Apparatus and are the direct responsibility of subcommittee E-41.06 that deals with weighing devices.
