Editing Parts-per notation (section)

=== Long and short scales ===
{{main|Long and short scales}}
Because the [[names of large numbers|named numbers]] starting with a "[[Long and short scales|billion]]" have different values in different countries, the BIPM suggests avoiding the use of "ppb" and "ppt" to prevent misunderstanding. The U.S. [[National Institute of Standards and Technology]] (NIST) takes the stringent position, stating that "the language-dependent terms [...] are not acceptable for use with the SI to express the values of quantities".<ref>NIST: ''[http://physics.nist.gov/Pubs/SP811/sec07.html#7.10.3 Rules and Style Conventions for Expressing Values of Quantities: 7.10.3 ppm, ppb, and ppt]''.</ref>