History of Angstrom

	Revision 10 . . December 6, 2001 12:08 pm by GregLindahl
	Revision 9 . . (edit) December 4, 2001 4:28 pm by The Anome [linked BIPM]
	Revision 8 . . December 4, 2001 2:40 pm by (logged).109.250.xxx [quote from SI brochure regarding angstrom's deprecation]
	Revision 7 . . November 28, 2001 2:47 pm by (logged).109.250.xxx
	Revision 6 . . (edit) November 27, 2001 10:50 am by GregLindahl
	Revision 5 . . November 27, 2001 10:50 am by GregLindahl [deprecation is in the eye of the beholder; the unit is widely used ]
	Revision 4 . . November 27, 2001 10:04 am by (logged).111.13.xxx [note it is a deprecated non-SI unit; nanometres or picometres easily used instead]
	Revision 3 . . November 27, 2001 2:11 am by AxelBoldt
	Revision 2 . . (edit) October 26, 2001 8:13 pm by Dave McKee [Added use in measuring atomic diameters.]

---

Difference (from prior major revision) (no other diffs)

Changed: 3c3,5

This is a non-SI unit, and is therefore considered deprecated. It is listed in Table 8 of the SI brochure ("Other non-SI units currently accepted for use with the International System"). BIPM explains "Table 8 lists some other non-SI units which are currently accepted for use with the SI to satisfy the needs of commercial, legal and specialized scientific interests. These units should be defined in relation to the SI in every document in which they are used. Their use is not encouraged.". Nanometres or picometres can easily be used instead. However, despite its official deprecation, some scientists continue to use it anyway.

This is a non-SI unit, and is therefore considered deprecated. It is listed in Table 8 of the SI brochure ("Other non-SI units currently accepted for use with the International System"). BIPM explains "Table 8 lists some other non-SI units which are currently accepted for use with the SI to satisfy the needs of commercial, legal and specialized scientific interests. These units should be defined in relation to the SI in every document in which they are used. Their use is not encouraged.". Nanometres or picometres can easily be used instead. However, despite its official deprecation, some scientists continue to use it anyway, because it is more convenient to use units which correspond to the items being discussed, e.g. atoms, grains of interstellar dust, etc.