* Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads)
@ 2014-02-04 17:26 Anh Vo
2014-02-04 17:44 ` adambeneschan
` (2 more replies)
0 siblings, 3 replies; 9+ messages in thread
From: Anh Vo @ 2014-02-04 17:26 UTC (permalink / raw)
The Kilogram constants defined in package System.Dim.Other_Prefixes (s-dmotpr.ads) look different compared to others such as Meter, Second,... In addition, the values do not match with names in the comments on the right side. I would like to know why. By the way, the Meter, Kilogram and Second constant are repeated here for easy discussion.
-- SI prefixes for Meter
pragma Warnings (Off);
-- Turn off the all the dimension warnings
ym : constant Length := 1.0E-24; -- yocto
zm : constant Length := 1.0E-21; -- zepto
am : constant Length := 1.0E-18; -- atto
fm : constant Length := 1.0E-15; -- femto
pm : constant Length := 1.0E-12; -- pico
nm : constant Length := 1.0E-09; -- nano
Gm : constant Length := 1.0E+09; -- giga
Tm : constant Length := 1.0E+12; -- tera
Pem : constant Length := 1.0E+15; -- peta
Em : constant Length := 1.0E+18; -- exa
Zem : constant Length := 1.0E+21; -- zetta
Yom : constant Length := 1.0E+24; -- yotta
-- SI prefixes for Kilogram
yg : constant Mass := 1.0E-27; -- yocto
zg : constant Mass := 1.0E-24; -- zepto
ag : constant Mass := 1.0E-21; -- atto
fg : constant Mass := 1.0E-18; -- femto
pg : constant Mass := 1.0E-15; -- pico
ng : constant Mass := 1.0E-12; -- nano
Gg : constant Mass := 1.0E+06; -- giga
Tg : constant Mass := 1.0E+09; -- tera
Peg : constant Mass := 1.0E+13; -- peta
Eg : constant Mass := 1.0E+15; -- exa
Zeg : constant Mass := 1.0E+18; -- zetta
Yog : constant Mass := 1.0E+21; -- yotta
-- SI prefixes for Second
ys : constant Time := 1.0E-24; -- yocto
zs : constant Time := 1.0E-21; -- zepto
as : constant Time := 1.0E-18; -- atto
fs : constant Time := 1.0E-15; -- femto
ps : constant Time := 1.0E-12; -- pico
ns : constant Time := 1.0E-09; -- nano
Gs : constant Time := 1.0E+09; -- giga
Ts : constant Time := 1.0E+12; -- tera
Pes : constant Time := 1.0E+15; -- peta
Es : constant Time := 1.0E+18; -- exa
Zes : constant Time := 1.0E+21; -- zetta
Yos : constant Time := 1.0E+24; -- yotta
--...
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads)
2014-02-04 17:26 Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads) Anh Vo
@ 2014-02-04 17:44 ` adambeneschan
2014-02-04 18:10 ` G.B.
2014-02-04 18:19 ` Ludovic Brenta
2014-02-05 7:44 ` Yannick Duchêne (Hibou57)
2 siblings, 1 reply; 9+ messages in thread
From: adambeneschan @ 2014-02-04 17:44 UTC (permalink / raw)
On Tuesday, February 4, 2014 9:26:05 AM UTC-8, Anh Vo wrote:
> The Kilogram constants defined in package System.Dim.Other_Prefixes (s-dmotpr.ads) look different compared to others such as Meter, Second,... In addition, the values do not match with names in the comments on the right side. I would like to know why. By the way, the Meter, Kilogram and Second constant are repeated here for easy discussion.
"Kilo" is a prefix, so why is there a section on "SI prefixes for Kilogram" in the first place? (Instead of "SI prefixes for Gram".)
-- Adam
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads)
2014-02-04 17:44 ` adambeneschan
@ 2014-02-04 18:10 ` G.B.
2014-02-04 18:16 ` adambeneschan
0 siblings, 1 reply; 9+ messages in thread
From: G.B. @ 2014-02-04 18:10 UTC (permalink / raw)
On 04.02.14 18:44, adambeneschan@gmail.com wrote:
> On Tuesday, February 4, 2014 9:26:05 AM UTC-8, Anh Vo wrote:
>> The Kilogram constants defined in package System.Dim.Other_Prefixes (s-dmotpr.ads) look different compared to others such as Meter, Second,... In addition, the values do not match with names in the comments on the right side. I would like to know why. By the way, the Meter, Kilogram and Second constant are repeated here for easy discussion.
>
> "Kilo" is a prefix, so why is there a section on "SI prefixes for Kilogram" in the first place? (Instead of "SI prefixes for Gram".)
I guess "Kilogram" reflects MKS of the SI base units
(meters, kilograms, seconds); this explains the difference
of 3 in the exponent of 10, accounting for base unit's
weight of 1_000 grams.
GNAT changes the official SI prefix for micro-, which is µ,
to u. This seems in line with geeky use and with avoiding
plain text character π from the reference manual. (I understand
that the US Navy has lifted the former restriction on the
number of bits to be used for characters?)
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads)
2014-02-04 18:10 ` G.B.
@ 2014-02-04 18:16 ` adambeneschan
2014-02-04 18:22 ` adambeneschan
0 siblings, 1 reply; 9+ messages in thread
From: adambeneschan @ 2014-02-04 18:16 UTC (permalink / raw)
On Tuesday, February 4, 2014 10:10:34 AM UTC-8, G.B. wrote:
> > On Tuesday, February 4, 2014 9:26:05 AM UTC-8, Anh Vo wrote:
>
> >> The Kilogram constants defined in package System.Dim.Other_Prefixes (s-dmotpr.ads) look different compared to others such as Meter, Second,... In addition, the values do not match with names in the comments on the right side. I would like to know why. By the way, the Meter, Kilogram and Second constant are repeated here for easy discussion.
>
> >
>
> > "Kilo" is a prefix, so why is there a section on "SI prefixes for Kilogram" in the first place? (Instead of "SI prefixes for Gram".)
>
> I guess "Kilogram" reflects MKS of the SI base units
> (meters, kilograms, seconds); this explains the difference
> of 3 in the exponent of 10, accounting for base unit's
> weight of 1_000 grams.
OK, that would make sense.
-- Adam
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads)
2014-02-04 18:16 ` adambeneschan
@ 2014-02-04 18:22 ` adambeneschan
0 siblings, 0 replies; 9+ messages in thread
From: adambeneschan @ 2014-02-04 18:22 UTC (permalink / raw)
On Tuesday, February 4, 2014 10:16:58 AM UTC-8, adambe...@gmail.com wrote:
> > I guess "Kilogram" reflects MKS of the SI base units
> > (meters, kilograms, seconds); this explains the difference
> > of 3 in the exponent of 10, accounting for base unit's
> > weight of 1_000 grams.
>
> OK, that would make sense.
Actually, it's consistent with the declarations in s-dimmks.ads--I just checked.
-- Adam
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads)
2014-02-04 17:26 Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads) Anh Vo
2014-02-04 17:44 ` adambeneschan
@ 2014-02-04 18:19 ` Ludovic Brenta
2014-02-04 19:44 ` Anh Vo
2014-02-05 7:44 ` Yannick Duchêne (Hibou57)
2 siblings, 1 reply; 9+ messages in thread
From: Ludovic Brenta @ 2014-02-04 18:19 UTC (permalink / raw)
Anh Vo <anhvofrcaus@gmail.com> writes:
> The Kilogram constants defined in package System.Dim.Other_Prefixes
> (s-dmotpr.ads) look different compared to others such as Meter,
> Second,... In addition, the values do not match with names in the
> comments on the right side. I would like to know why. By the way, the
> Meter, Kilogram and Second constant are repeated here for easy
> discussion.
Because the base SI unit for weight is not gram, it is kilogram. This
explains the difference in exponents. Also, in s-dimmks.ads, note how
the gram is defined:
ug : constant Mass := 1.0E-09; -- micro (u)
mg : constant Mass := 1.0E-06; -- milli
cg : constant Mass := 1.0E-05; -- centi
dg : constant Mass := 1.0E-04; -- deci
g : constant Mass := 1.0E-03; -- gram
dag : constant Mass := 1.0E-02; -- deka
hg : constant Mass := 1.0E-01; -- hecto
Meg : constant Mass := 1.0E+03; -- mega
--
Ludovic Brenta.
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads)
2014-02-04 18:19 ` Ludovic Brenta
@ 2014-02-04 19:44 ` Anh Vo
0 siblings, 0 replies; 9+ messages in thread
From: Anh Vo @ 2014-02-04 19:44 UTC (permalink / raw)
On Tuesday, February 4, 2014 10:19:27 AM UTC-8, Ludovic Brenta wrote:
> Anh Vo <anhvofrcaus@gmail.com> writes:
> > The Kilogram constants defined in package System.Dim.Other_Prefixes
> > (s-dmotpr.ads) look different compared to others such as Meter,
> > Second,... In addition, the values do not match with names in the
> > comments on the right side. I would like to know why. By the way, the
> > Meter, Kilogram and Second constant are repeated here for easy
> > discussion.
>
> Because the base SI unit for weight is not gram, it is kilogram. This
> explains the difference in exponents. Also, in s-dimmks.ads, note how
> the gram is defined:
>
> ug : constant Mass := 1.0E-09; -- micro (u)
> mg : constant Mass := 1.0E-06; -- milli
> cg : constant Mass := 1.0E-05; -- centi
> dg : constant Mass := 1.0E-04; -- deci
> g : constant Mass := 1.0E-03; -- gram
> dag : constant Mass := 1.0E-02; -- deka
> hg : constant Mass := 1.0E-01; -- hecto
> Meg : constant Mass := 1.0E+03; -- mega
Thank you for your explanation.
A. Vo
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads)
2014-02-04 17:26 Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads) Anh Vo
2014-02-04 17:44 ` adambeneschan
2014-02-04 18:19 ` Ludovic Brenta
@ 2014-02-05 7:44 ` Yannick Duchêne (Hibou57)
2014-02-05 9:30 ` AdaMagica
2 siblings, 1 reply; 9+ messages in thread
From: Yannick Duchêne (Hibou57) @ 2014-02-05 7:44 UTC (permalink / raw)
Le Tue, 04 Feb 2014 18:26:05 +0100, Anh Vo <anhvofrcaus@gmail.com> a écrit:
> The Kilogram constants defined in package System.Dim.Other_Prefixes
> (s-dmotpr.ads) look different compared to others such as Meter,
> Second,... In addition, the values do not match with names in the
> comments on the right side. I would like to know why. By the way, the
> Meter, Kilogram and Second constant are repeated here for easy
> discussion.
>
> -- SI prefixes for Meter
>
> pragma Warnings (Off);
> -- Turn off the all the dimension warnings
>
> ym : constant Length := 1.0E-24; -- yocto
> zm : constant Length := 1.0E-21; -- zepto
> am : constant Length := 1.0E-18; -- atto
> […]
Excuse me, is this GNAT specific? I can't find this in the RM. If this is
in the RM, then I did not knew there was such a package in System.
--
“Syntactic sugar causes cancer of the semi-colons.” [1]
“Structured Programming supports the law of the excluded muddle.” [1]
[1]: Epigrams on Programming — Alan J. — P. Yale University
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2014-02-04 17:26 Kilogram constant defined in package System.Dim.Other_Prefixes (s-dmotpr.ads) Anh Vo
2014-02-04 17:44 ` adambeneschan
2014-02-04 18:10 ` G.B.
2014-02-04 18:16 ` adambeneschan
2014-02-04 18:22 ` adambeneschan
2014-02-04 18:19 ` Ludovic Brenta
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2014-02-05 7:44 ` Yannick Duchêne (Hibou57)
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