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A [[runway]] number typically indicates its heading in [[decadegree]]s.
A [[runway]] number typically indicates its heading in [[decadegree]]s.


Before the symbol as an [[SI prefix]] was standardized as "da" with the introduction of the [[International System of Units]] in 1960, various other symbols were more common, such as "dk" (e.g. in the UK and Austria), "D" (e.g. in Germany), and "Da". For syntactical reasons, the [[HP 48G|HP 48]]<!-- at least 48G/GX/G+/GII, not sure about 48S/SX-->, [[HP 49/50 series|49, 50]] series as well as the [[HP 39gII]] and [[HP Prime|Prime]] calculators use the unit prefix "D".<ref name="HP48_UG">{{cite book | title=HP&nbsp;48G Series – User's Guide (UG) | publisher=[[Hewlett-Packard]] | edition=8 | date=December 1994 | id=HP 00048-90126, (00048-90104) | orig-year=1993<!-- edition 1 (1993-05) --> | url=http://www.hpcalc.org/details.php?id=3937 | accessdate=2015-09-06}}</ref><ref name="HP50g_UG">{{cite book | title=HP 50g graphing calculator user's guide (UG) | publisher=[[Hewlett-Packard]] | edition=1 | date=2006-04-01 | id=HP F2229AA-90006 | url=http://www.hpcalc.org/details.php?id=6512 | accessdate=2015-10-10}}</ref><ref name="HP-Prime_UG">{{cite book | title=HP Prime Graphing Calculator User Guide (UG) | publisher=[[Hewlett-Packard Development Company, L.P.]] | edition=1 | date=October 2014 | id=HP 788996-001 | url=http://h10032.www1.hp.com/ctg/Manual/c04119981.pdf | accessdate=2015-10-13}}</ref>
Before the symbol as an [[SI prefix]] was standardized as "da" with the introduction of the [[International System of Units]] in 1960, various other symbols were more common, such as "dk" (e.g. in the UK and Austria), "D" (e.g. in Germany), and "Da". For syntactical reasons, the [[HP 48G|HP 48]]<!-- at least 48G/GX/G+/GII, not sure about 48S/SX-->, [[HP 49/50 series|49, 50]] series as well as the [[HP 39gII]] and [[HP Prime|Prime]] calculators use the unit prefix "D".<ref name="HP48_UG">{{cite book | title=HP&nbsp;48G Series – User's Guide (UG) | publisher=[[Hewlett-Packard]] | edition=8 | date=December 1994 | id=HP 00048-90126, (00048-90104) | orig-year=1993<!-- edition 1 (1993-05) --> | url=http://www.hpcalc.org/details.php?id=3937 | accessdate=2015-09-06}}</ref><ref name="HP50g_UG">{{cite book | title=HP 50g graphing calculator user's guide (UG) | publisher=[[Hewlett-Packard]] | edition=1 | date=2006-04-01 | id=HP F2229AA-90006 | url=http://www.hpcalc.org/details.php?id=6512 | accessdate=2015-10-10}}</ref><ref name="HP-Prime_UG">{{cite book | title=HP Prime Graphing Calculator User Guide (UG) | publisher=[[Hewlett-Packard Development Company, L.P.]] | edition=1 | date=October 2014 | id=HP 788996-001 | url=http://h10032.www1.hp.com/ctg/Manual/c04119981.pdf | accessdate=2015-10-13 | deadurl=yes | archiveurl=https://web.archive.org/web/20140903201341/http://h10032.www1.hp.com/ctg/Manual/c04119981.pdf | archivedate=2014-09-03 | df= }}</ref>


* 1 decametre = 10 [[metre]]s
* 1 decametre = 10 [[metre]]s

Revision as of 18:18, 7 September 2017

This article is about the SI prefix. For other uses, see Deca.
Look up deca- in Wiktionary, the free dictionary.

Deca- or deka-[1] (symbol da) is a decimal unit prefix in the metric system, denoting a factor of ten. The term is derived from the Greek deka (δέκα), meaning "ten".

The prefix was a part of the original metric system in 1795. It is not in very common usage, although the decapascal is occasionally used by audiologists. The decanewton is also encountered occasionally, probably because it is an SI approximation of the kilogram-force. Its use is more common in Central Europe. In German, Polish (deka, deko), Czech, Slovak and Hungarian, deca is common (and used as a word on its own always means decagram). A runway number typically indicates its heading in decadegrees.

Before the symbol as an SI prefix was standardized as "da" with the introduction of the International System of Units in 1960, various other symbols were more common, such as "dk" (e.g. in the UK and Austria), "D" (e.g. in Germany), and "Da". For syntactical reasons, the HP 48, 49, 50 series as well as the HP 39gII and Prime calculators use the unit prefix "D".[2][3][4]

Examples:

  • The blue whale is approximately 30 meters or 3 decameters in length.[5]
SI prefixes
Prefix Base 10 Decimal Adoption
[nb 1]
Name Symbol
quetta Q 1030 1000000000000000000000000000000 2022[6]
ronna R 1027 1000000000000000000000000000
yotta Y 1024 1000000000000000000000000 1991
zetta Z 1021 1000000000000000000000
exa E 1018 1000000000000000000 1975[7]
peta P 1015 1000000000000000
tera T 1012 1000000000000 1960
giga G 109 1000000000
mega M 106 1000000 1873
kilo k 103 1000 1795
hecto h 102 100
deca da 101 10
— — 100 1 —
deci d 10−1 0.1 1795
centi c 10−2 0.01
milli m 10−3 0.001
micro μ 10−6 0.000001 1873
nano n 10−9 0.000000001 1960
pico p 10−12 0.000000000001
femto f 10−15 0.000000000000001 1964
atto a 10−18 0.000000000000000001
zepto z 10−21 0.000000000000000000001 1991
yocto y 10−24 0.000000000000000000000001
ronto r 10−27 0.000000000000000000000000001 2022[6]
quecto q 10−30 0.000000000000000000000000000001
Notes
  1. ^ Prefixes adopted before 1960 already existed before SI. The introduction of the CGS system was in 1873.

See also

References

  1. ^ Guide for the Use of the International System of Units (SI), 1995, NIST Special Publication 811
  2. ^ HP 48G Series – User's Guide (UG) (8 ed.). Hewlett-Packard. December 1994 [1993]. HP 00048-90126, (00048-90104). Retrieved 2015-09-06.
  3. ^ HP 50g graphing calculator user's guide (UG) (1 ed.). Hewlett-Packard. 2006-04-01. HP F2229AA-90006. Retrieved 2015-10-10.
  4. ^ HP Prime Graphing Calculator User Guide (UG) (PDF) (1 ed.). Hewlett-Packard Development Company, L.P. October 2014. HP 788996-001. Archived from the original (PDF) on 2014-09-03. Retrieved 2015-10-13. {{cite book}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  5. ^ http://channel.nationalgeographic.com/channel/content/kingdom-of-the-blue-whale-3302/blue-whale-facts/#/compare/length
  6. ^ a b "On the extension of the range of SI prefixes". 18 November 2022. Retrieved 5 February 2023.
  7. ^ "Metric (SI) Prefixes". NIST.
Look up deca- in Wiktionary, the free dictionary.
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