* \usemodule[units] @ 2002-02-05 18:25 Willi Egger 2002-02-06 9:13 ` \usemodule[units] Eckhart Guthöhrlein 0 siblings, 1 reply; 12+ messages in thread From: Willi Egger @ 2002-02-05 18:25 UTC (permalink / raw) Hi, I am not familiar with the ISO-norm concerning the use of upper and lower case for units. - My question is, if there is a definition for the 'liter'. Is the abbreviation 'l' of 'L'. Further how to write Milliliter: 'ml' or 'mL'? Regards Willi ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: \usemodule[units] 2002-02-05 18:25 \usemodule[units] Willi Egger @ 2002-02-06 9:13 ` Eckhart Guthöhrlein 2002-02-07 0:01 ` \usemodule[units] Hartmut Henkel 0 siblings, 1 reply; 12+ messages in thread From: Eckhart Guthöhrlein @ 2002-02-06 9:13 UTC (permalink / raw) Cc: ntg-context Willi Egger wrote: > I am not familiar with the ISO-norm concerning the use of upper and lower > case for units. - My question is, if there is a definition for the 'liter'. > Is the abbreviation 'l' of 'L'. Further how to write Milliliter: 'ml' or > 'mL'? Both are officially correct at the moment. After an evaluation period, one of them will be dropped (perhaps, this evaluation period has already been extended...). I have the ISO standard at home, I will look up and mail the exact wording tomorrow. In Europe, 'l' is common, whereas 'L' is preferred in the USA (and therefore in scientific literature). Pick your choice. Apropos ISO: just think of the decimal sign. ISO says: "The decimal sign is a comma on the line." Now, look at numbers in English texts... Eckhart ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: \usemodule[units] 2002-02-06 9:13 ` \usemodule[units] Eckhart Guthöhrlein @ 2002-02-07 0:01 ` Hartmut Henkel 2002-02-07 10:10 ` Re[2]: \usemodule[units] Giuseppe Bilotta 0 siblings, 1 reply; 12+ messages in thread From: Hartmut Henkel @ 2002-02-07 0:01 UTC (permalink / raw) Cc: Willi Egger, ntg-context >From http://physics.nist.gov/cuu/Units/outside.html: ``The liter in Table 6 deserves comment. This unit and its symbol l were adopted by the CIPM in 1879. The alternative symbol for the liter, L, was adopted by the CGPM in 1979 in order to avoid the risk of confusion between the letter l and the number 1. Thus, although both l and L are internationally accepted symbols for the liter, to avoid this risk the preferred symbol for use in the United States is L. Neither a lowercase script letter l nor an uppercase script letter L are approved symbols for the liter.'' Didn't know this. Sitting in Germany I thought it would be definitely the `l'. Greetings Hartmut On Wed, 6 Feb 2002, Eckhart Guthöhrlein wrote: > Willi Egger wrote: > > > I am not familiar with the ISO-norm concerning the use of upper and lower > > case for units. - My question is, if there is a definition for the 'liter'. > > Is the abbreviation 'l' of 'L'. Further how to write Milliliter: 'ml' or > > 'mL'? > > Both are officially correct at the moment. After an evaluation period, > one of them will be dropped (perhaps, this evaluation period has already > been extended...). I have the ISO standard at home, I will look up and > mail the exact wording tomorrow. > In Europe, 'l' is common, whereas 'L' is preferred in the USA (and > therefore in scientific literature). Pick your choice. > Apropos ISO: just think of the decimal sign. ISO says: "The decimal sign > is a comma on the line." Now, look at numbers in English texts... > > Eckhart ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re[2]: \usemodule[units] 2002-02-07 0:01 ` \usemodule[units] Hartmut Henkel @ 2002-02-07 10:10 ` Giuseppe Bilotta 2002-02-07 12:33 ` Symbol for the unit litre (was: \usemodule[units]) Eckhart Guthöhrlein 0 siblings, 1 reply; 12+ messages in thread From: Giuseppe Bilotta @ 2002-02-07 10:10 UTC (permalink / raw) Cc: ntg-context Thursday, February 07, 2002 Hartmut Henkel wrote: HH> Didn't know this. Sitting in Germany I thought it would be definitely HH> the `l'. Lowercase roman `l' is the one used in Italy as well. -- Giuseppe "Oblomov" Bilotta ^ permalink raw reply [flat|nested] 12+ messages in thread
* Symbol for the unit litre (was: \usemodule[units]) 2002-02-07 10:10 ` Re[2]: \usemodule[units] Giuseppe Bilotta @ 2002-02-07 12:33 ` Eckhart Guthöhrlein 2002-02-08 9:05 ` Hans Hagen 0 siblings, 1 reply; 12+ messages in thread From: Eckhart Guthöhrlein @ 2002-02-07 12:33 UTC (permalink / raw) I think we can agree that 'l' is the common symbol in Europe, whereas 'L' is used in the USA. Here are some sources of further information for those interested. ISO 31-0:1992(E) "The two symbols for litre are on an equal footing. The CIPM will, however, make a survey on the development of the use of the two symbols in order to see if one of the two may be suppressed." Selected parts from: Bureau Internationaldes Poids et Mesures, The International System of Units (SI), 7th edition, 1998 (available online at http://www.bipm.fr/enus/6_Publications/si/si-brochure.html) "(c) This unit and the symbol l were adopted by CIPM in 1879 (PV, 1879, 41). The alternative symbol , L , was adopted by the 16th CGPM (1979, Resolution 6; CR, 101 and Metrologia, 1980, 16, 56-57) in order to avoid the risk of confusion between the letter l and the number 1. The present definition of the litre is given in Resolution 6 of the 12th CGPM (1964; CR, 93)." (p. 105) "The 16th Conférence Générale des Poids et Mesures (CGPM), recognizing the general principles adopted for writing the unit symbols in Resolution 7 of the 9th CGPM (1948), considering that the symbol l for the unit litre was adopted by the Comité International des Poids et Mesures (CIPM) in 1879 and confirmed in the same Resolution of 1948, considering also that, in order to avoid the risk of confusion between the letter l and the number 1, several countries have adopted the symbol L instead of l for the unit litre, considering that the name litre, although not included in the Système International d'Unités, must be admitted for general use with the System, decides, as an exception, to adopt the two symbols l and L as symbols to be used for the unit litre, considering further that in the future only one of these two symbols should be retained, invites the CIPM to follow the development of the use of these two symbols and to give the 18th CGPM its opinion as to the possibility of suppressing one of them." (p. 131f) "The CIPM, in 1990, considered that it was still too early to choose a single symbol for the litre." (p. 132) So, the unit litre is in fact the only one with two officialy accepted symbols. So, besides any local practice, one has to consider which symbol - if any - is preferrable and should be supported. Eckhart ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Symbol for the unit litre (was: \usemodule[units]) 2002-02-07 12:33 ` Symbol for the unit litre (was: \usemodule[units]) Eckhart Guthöhrlein @ 2002-02-08 9:05 ` Hans Hagen 2002-02-08 12:43 ` Eckhart Guthöhrlein 2002-02-08 21:52 ` Willi Egger 0 siblings, 2 replies; 12+ messages in thread From: Hans Hagen @ 2002-02-08 9:05 UTC (permalink / raw) Cc: ntg-context So, given the replies, i think that we should change the "L" into "l"; user can remap this to $el$ if needed; an alternative is to use a symbol liter, that then can be redefined. ok? Hans ------------------------------------------------------------------------- Hans Hagen | PRAGMA ADE | pragma@wxs.nl Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | www.pragma-ade.com ------------------------------------------------------------------------- fall-back web server: www.pragma-pod.nl ------------------------------------------------------------------------- ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Symbol for the unit litre (was: \usemodule[units]) 2002-02-08 9:05 ` Hans Hagen @ 2002-02-08 12:43 ` Eckhart Guthöhrlein 2002-02-08 21:52 ` Willi Egger 1 sibling, 0 replies; 12+ messages in thread From: Eckhart Guthöhrlein @ 2002-02-08 12:43 UTC (permalink / raw) Cc: ntg-context Hans Hagen wrote: > So, given the replies, i think that we should change the "L" into "l"; > user can remap this to $el$ if needed; an alternative is to use a symbol > liter, that then can be redefined. > > ok? > I can agree with 'l' being the default and 'L' being an option, but I think we should forget about that $\el$ (see my reply to Willi this morning). Either 'L' or 'l', but no script letters for units. International standards allow both 'L' and 'l', regional usage varies. Maybe an option for internationalization, e.g. german -> 'l' and US english -> 'L'. Eckhart ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Symbol for the unit litre (was: \usemodule[units]) 2002-02-08 9:05 ` Hans Hagen 2002-02-08 12:43 ` Eckhart Guthöhrlein @ 2002-02-08 21:52 ` Willi Egger 2002-02-09 20:34 ` Johannes Hüsing ` (2 more replies) 1 sibling, 3 replies; 12+ messages in thread From: Willi Egger @ 2002-02-08 21:52 UTC (permalink / raw) Cc: ntg-context Hans, It sounds as it is a question of taste. - To my taste I would be happy with a 'l' because when you write 'mL' it is pritty strange to read. - I do hope, that readers who encounter 'ml' are aware of the text they read. - Finally we should not concentrate on the DAU (Der Dümmste Anzunehmende User). Willi ----- Original Message ----- From: Hans Hagen <pragma@wxs.nl> To: Eckhart Guthöhrlein <eckhart.guthoehrlein@uni-bielefeld.de> Cc: ntg-context <ntg-context@ntg.nl> Sent: Friday, February 08, 2002 10:05 AM Subject: Re: Symbol for the unit litre (was: \usemodule[units]) > So, given the replies, i think that we should change the "L" into "l"; user > can remap this to $el$ if needed; an alternative is to use a symbol liter, > that then can be redefined. > > ok? > > Hans > ------------------------------------------------------------------------- > Hans Hagen | PRAGMA ADE | pragma@wxs.nl > Ridderstraat 27 | 8061 GH Hasselt | The Netherlands > tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | www.pragma-ade.com > ------------------------------------------------------------------------- > fall-back web server: > www.pragma-pod.nl > ------------------------------------------------------------------------- > > ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Symbol for the unit litre (was: \usemodule[units]) 2002-02-08 21:52 ` Willi Egger @ 2002-02-09 20:34 ` Johannes Hüsing 2002-02-10 20:26 ` Hans Hagen 2002-02-13 1:33 ` K.H. Wesseling 2 siblings, 0 replies; 12+ messages in thread From: Johannes Hüsing @ 2002-02-09 20:34 UTC (permalink / raw) On Fri, Feb 08, 2002 at 10:52:57PM +0100, Willi Egger wrote: [...] > that readers who encounter 'ml' are aware of the text they read. - Finally > we should not concentrate on the DAU (Der Dümmste Anzunehmende User). > you mean, citizens of the US of A? <dodge/> -- Johannes Hüsing There is something fascinating about science. One gets hannes@ruhrau.de such wholesale returns of conjecture from such a trifling investment of fact. Mark Twain ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Symbol for the unit litre (was: \usemodule[units]) 2002-02-08 21:52 ` Willi Egger 2002-02-09 20:34 ` Johannes Hüsing @ 2002-02-10 20:26 ` Hans Hagen 2002-02-13 1:33 ` K.H. Wesseling 2 siblings, 0 replies; 12+ messages in thread From: Hans Hagen @ 2002-02-10 20:26 UTC (permalink / raw) Cc: ntg-context At 10:52 PM 2/8/2002 +0100, Willi Egger wrote: >Hans, > >It sounds as it is a question of taste. - To my taste I would be happy with >a 'l' because when you write 'mL' it is pritty strange to read. - I do hope, >that readers who encounter 'ml' are aware of the text they read. - Finally >we should not concentrate on the DAU (Der Dümmste Anzunehmende User). [ah, you still can write german (or is this swiss)] So i patched m-units: %D After some discussion on the \CONTEXT\ mailing list in %D february 2002 it was decided to go from L to l for liters %D (Karel Wesselings alternative: \mathematics{\el}). \getvalue{\v!eenheid} [Liter] {l} {liter} Hans ------------------------------------------------------------------------- Hans Hagen | PRAGMA ADE | pragma@wxs.nl Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | www.pragma-ade.com ------------------------------------------------------------------------- fall-back web server: www.pragma-pod.nl ------------------------------------------------------------------------- ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Symbol for the unit litre (was: \usemodule[units]) 2002-02-08 21:52 ` Willi Egger 2002-02-09 20:34 ` Johannes Hüsing 2002-02-10 20:26 ` Hans Hagen @ 2002-02-13 1:33 ` K.H. Wesseling 2 siblings, 0 replies; 12+ messages in thread From: K.H. Wesseling @ 2002-02-13 1:33 UTC (permalink / raw) Cc: ntg-context A little late, but it took some searching in old Xerox's piles. Late, but as far as I'm concerned a last word: In a NASA special report: ------------------------- E A Mechtly: The International System of Units. Physical Constants and Conversion Factors. (1964) NASA SP-7012. Under Conversion factors --- Alphabetical listing: To convert from liter to meter^3 multiply by 1.000028e-3. It is in the same list as are, for example, the acre foot, bushel, cup, gallon, gill, hogshead, quart and tablespoon. The liter is not an SI unit. In an IEEE spectrum special report: ----------------------------------- D T Goldman (National Bureau of Standards): The metric system: its status and future. IEEE spectrum APRIL 1981, pp 60-63 Table VI Units in use with the International System ---------------------------------------------------- Name Symbol Value in SI Unit ---------------------------------------------------- minute min 1 min = 60 s .... liter L* 1 L = 1 dm^3 = 10^-3 m^3 .... hectare ... ---------------------------------------------------- * An alternative symbol for liter is "l". Since "l" can be easily confused with the numeral "1", the symbol "L" is recommended for United States use. ---------------------------------------------------- The liter is not SI. Its symbol is "l" everywhere except in the USA where it is "L". History: -------- The 1875 Convention of the Meter in Paris, convened at the initiative of the French government called for dissemination of international prototype standards of the meter and the kilogram. .... As early as 1881, the First International Electrical Congres in Paris aproved the ampere as the practical unit of electrical current. .... This received official endorsement in 1935 from the Electrotechnical Commission in Scheveningen,... .... The formal name of this system of units, Le Systeme International d'Unites (SI), was adopted in 1960. .... As of 1980, the United States was the sole remaining industrial country that did not have as a specific goal the eventual adoption of the modernized metric system. Karel. ------------------------------------------------------------------- On 10 Feb 2002, at 21:26, Hans Hagen wrote: > At 10:52 PM 2/8/2002 +0100, Willi Egger wrote: > >Hans, > > > >It sounds as it is a question of taste. - To my taste I would be > >happy with a 'l' because when you write 'mL' it is pritty strange to > >read. - I do hope, that readers who encounter 'ml' are aware of the > >text they read. - Finally we should not concentrate on the DAU (Der > >Dümmste Anzunehmende User). > > [ah, you still can write german (or is this swiss)] > > So i patched m-units: > > %D After some discussion on the \CONTEXT\ mailing list in > %D february 2002 it was decided to go from L to l for liters > %D (Karel Wesselings alternative: \mathematics{\el}). > > \getvalue{\v!eenheid} [Liter] {l} {liter} > > Hans > ---------------------------------------------------------------------- > --- > Hans Hagen | PRAGMA ADE | > pragma@wxs.nl > Ridderstraat 27 | 8061 GH Hasselt | The > Netherlands > tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | > www.pragma-ade.com > ---------------------------------------------------------------------- > --- > fall-back web server: > www.pragma-pod.nl > ---------------------------------------------------------------------- > --- > > ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Fw: \usemodule[units] @ 2002-02-08 8:09 Eckhart Guthöhrlein 2002-02-08 12:56 ` \usemodule[units] Nigel King 0 siblings, 1 reply; 12+ messages in thread From: Eckhart Guthöhrlein @ 2002-02-08 8:09 UTC (permalink / raw) Cc: ntg-context Willi Egger wrote: > ----- Original Message ----- > From: K.H. Wesseling <k.h.wesseling@planet.nl> > To: Willi Egger <w.egger@xs4all.nl> > Sent: Wednesday, February 06, 2002 11:01 PM > Subject: Re: \usemodule[units] > > > >>According an ISO report of many years ago published by the US >>National Bureau of Standards the litre is not ISO but may be used >>nevertheless, meaning 1 dm^3. It is lower case l and lower case ml. >>The problem is that l looks so much like 1 that the practical >>americans use L for l. In my publications I use the $\ell$ which >>produces a very clear letter that is not confuseable with either l or >>1. This is definitely not a good solution. It is not only the ISO standard, but also common practice that all units are printed in upright (roman) type. Why make an exception for the litre? If you really fear confusion -- which is unlikely with suitable fonts and a reader aware of what he is reading -- then it's better to use the uppercase L. >> >>Best wishes, Karel. >> >> >>On 5 Feb 2002, at 19:25, Willi Egger wrote: >> >> >>>Hi, >>> >>>I am not familiar with the ISO-norm concerning the use of upper and >>>lower case for units. - My question is, if there is a definition for >>>the 'liter'. Is the abbreviation 'l' of 'L'. Further how to write >>>Milliliter: 'ml' or 'mL'? >>> In any case: consistently, of course. BTW, it's always correct to use the full name of the unit... Eckhart ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: \usemodule[units] 2002-02-08 8:09 Fw: \usemodule[units] Eckhart Guthöhrlein @ 2002-02-08 12:56 ` Nigel King 0 siblings, 0 replies; 12+ messages in thread From: Nigel King @ 2002-02-08 12:56 UTC (permalink / raw) >>>> the 'liter'. Is the abbreviation 'l' of 'L'. Further how to write >>>> Milliliter: 'ml' or 'mL'? >>>> > > In any case: consistently, of course. BTW, it's always correct to use > the full name of the unit... But only if spelt correctly. -- Nigel ^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2002-02-13 1:33 UTC | newest] Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2002-02-05 18:25 \usemodule[units] Willi Egger 2002-02-06 9:13 ` \usemodule[units] Eckhart Guthöhrlein 2002-02-07 0:01 ` \usemodule[units] Hartmut Henkel 2002-02-07 10:10 ` Re[2]: \usemodule[units] Giuseppe Bilotta 2002-02-07 12:33 ` Symbol for the unit litre (was: \usemodule[units]) Eckhart Guthöhrlein 2002-02-08 9:05 ` Hans Hagen 2002-02-08 12:43 ` Eckhart Guthöhrlein 2002-02-08 21:52 ` Willi Egger 2002-02-09 20:34 ` Johannes Hüsing 2002-02-10 20:26 ` Hans Hagen 2002-02-13 1:33 ` K.H. Wesseling 2002-02-08 8:09 Fw: \usemodule[units] Eckhart Guthöhrlein 2002-02-08 12:56 ` \usemodule[units] Nigel King
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