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Deca-

This article is about the SI prefix. For other uses, see [[Deca (disambiguation)#REDIRECTmw:Help:Magic words#Other
This page is a soft redirect.Deca]].

Deca- or deka-[1] (symbol da) is a unit prefix in the metric system, denoting a factor of ten. The term is derived from the Greek 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 a word on its own always means decagram). A runway number typically indicates its heading in decadegrees.

Before the symbol was standardized as da with the introduction of the International System of Units in 1960, various other symbols were more common, such as "dk", "D", and "Da".

Examples:

  • The blue whale is approximately 30 meters or 3 decameters in length.[2]
Prefix 1000m 10n Decimal English word Since[n 1]
name symbol short scale long scale
yotta Y  10008  1024 Script error: No such module "Gaps".  septillion  quadrillion 1991
zetta Z  10007  1021 Script error: No such module "Gaps".  sextillion  thousand trillion 1991
exa E  10006  1018 Script error: No such module "Gaps".  quintillion  trillion 1975
peta P  10005  1015 Script error: No such module "Gaps".  quadrillion  thousand billion 1975
tera T  10004  1012 Script error: No such module "Gaps".  trillion  billion 1960
giga G  10003  109 Script error: No such module "Gaps".  billion  thousand million 1960
mega M  10002  106 Script error: No such module "Gaps".             million 1960
kilo k  10001  103 Script error: No such module "Gaps".             thousand 1795
hecto h  10002/3  102 100             hundred 1795
deca da  10001/3  101 10             ten 1795
 10000  100 1             one
deci d  1000−1/3  10−1 0.1             tenth 1795
centi c  1000−2/3   10−2 0.01             hundredth 1795
milli m  1000−1  10−3 0.001             thousandth 1795
micro μ  1000−2  10−6 Script error: No such module "Gaps".             millionth 1960
nano n  1000−3  10−9 Script error: No such module "Gaps".  billionth  thousand millionth 1960
pico p  1000−4  10−12 Script error: No such module "Gaps".  trillionth  billionth 1960
femto f  1000−5  10−15 Script error: No such module "Gaps".  quadrillionth  thousand billionth 1964
atto a  1000−6  10−18 Script error: No such module "Gaps".  quintillionth  trillionth 1964
zepto z  1000−7  10−21 Script error: No such module "Gaps".  sextillionth  thousand trillionth 1991
yocto y  1000−8  10−24  Script error: No such module "Gaps".  septillionth  quadrillionth  1991
  1. ^ The metric system was introduced in 1795 with six metric prefixes. The other dates relate to recognition by a resolution of the General Conference on Weights and Measures (CGPM).

References

  1. ^ Guide for the Use of the International System of Units (SI), 1995, NIST Special Publication 811
  2. ^ http://channel.nationalgeographic.com/channel/content/kingdom-of-the-blue-whale-3302/blue-whale-facts/#/compare/length

External links