Title: RE: Obsolete units
Terry Simpson wrote in USMA 24012

Joseph B. Reid wrote:
>>>That would mean that Terry would not encourage the use of
>>>nautical mile, knot, and hectare.
>>
>>I am merely following what the BIPM brochure says.
>


>No!  The BIPM brochure, "The International System of Units", lists
>nautical mile, knot and hectare as "Other non-SI units currently
>accepted for use with the International System".

Yes I see that. But it also says 'Their use is not encouraged'.



The BIPM bible states:

"4.1  *Units used with the SI*
The CIPM (1969), recognizing that users would wish to employ the SI with units which are not part of it but are important and widely used, listed three categories of non-SI units: units to be maintained; to be tolerated temporarily; and to be avoided.
...............................................................................
"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."

Table 8 lists nautical mile, knot, are, hectare, bar, �ngstr�m, and barn.
--
Joseph B. Reid
17 Glebe Road West
Toronto  M5P 1C8                Telephone 416-486-6071

--
Joseph B. Reid
17 Glebe Road West
Toronto  M5P 1C8                Telephone 416-486-6071



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