Paul Giaccone Sent:
Centi-, deci-, deca- and hecto- are not officially part of SI nomenclature.
That's not what the Bureau Internatoinal des Poids et Mesures (http://www.bipm.org/en/si/si_brochure/chapter3/prefixes.html) says.
Does the second officially take any prefix? Can you talk about a "megasecond", Yes. (Although it is EXTREMELY unusual).
or would you convert this to the more usual "11 days, 13 hours, 46 minutes and 40 seconds"? Indeed, does the library have a mechanism for doing this sort of breakdown of time? I suspect not, as time is not base 10.
Is the litre officially an SI unit? According to http://www.bipm.org/en/CGPM/db/16/6/ it wasn't in 1980. I think it unlikely to have become one since.
It looks like there is a large number of things to consider in this library. I hope the ever-growing wish list doesn't end up pushing the release date of the library back for ever or causing it to end up being rejected just because there is a host of extra requirements that it does not yet fulfil.
Here here! -- Martin Bonner Martin.Bonner@Pitechnology.com Pi Technology, Milton Hall, Ely Road, Milton, Cambridge, CB4 6WZ, ENGLAND Tel: +44 (0)1223 203894
Martin Bonner wrote:
Paul Giaccone Sent:
Centi-, deci-, deca- and hecto- are not officially part of SI nomenclature.
That's not what the Bureau Internatoinal des Poids et Mesures (http://www.bipm.org/en/si/si_brochure/chapter3/prefixes.html) says.
Interesting... I stand corrected. But are they in official scientific use?
Does the second officially take any prefix? Can you talk about a "megasecond",
Yes. (Although it is EXTREMELY unusual).
Quoting your source back at you, Martin... according to the section at the bottom of the page, you can't officially say "megasecond". Paul
| -----Original Message----- | From: boost-bounces@lists.boost.org | [mailto:boost-bounces@lists.boost.org] On Behalf Of Martin Bonner | Sent: 08 June 2006 15:35 | To: boost@lists.boost.org | Subject: Re: [boost] [review] pqs | > Does the second officially take any prefix? Can you talk about a | > "megasecond", | Yes. (Although it is EXTREMELY unusual). On the contrary: a kilosecond is about 15 minutes - a tea break, a megasecond is about a fortnight - a holiday, and a gigsecond is about 70 years - a lifetime. Isn't SI wonderful ;-)) But I digress - and so have others - I think we should focus on the basic structure of PQS rather than detail like this. Whatever the SI rules say, some people always want to do it their own way in their units and multiples, so we MUST be able to permit this, even if it is discouraged but the library making it more troublesome. Paul --- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539561830 & SMS, Mobile +44 7714 330204 & SMS pbristow@hetp.u-net.com
Paul A Bristow wrote:
Whatever the SI rules say, some people always want to do it their own way in their units and multiples, so we MUST be able to permit this, even if it is discouraged but the library making it more troublesome.
No library should try to make something more troublesome when it is part of the core functionality of the library. Some people really do need to work outside the S.I. units, if for no other reason than S.I. doesn't define all the units one needs in the world. -Dave
participants (4)
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David Greene -
Martin Bonner -
Paul A Bristow -
Paul Giaccone