Deci (symbol d) is a prefix in the metric system denoting a factor of one tenth. Adopted in 1795, the prefix comes from the Latin decimus, meaning tenth. Its most frequent use is in the non-SI unit, the decibel, used to measure sound intensity (relative to a reference) and many other ratios.

Metric prefixes
Prefix Symbol 1000m 10n Decimal Short scale Long scale Since[n 1]
yotta Y 10008 1024 1000000000000000000000000 Septillion Quadrillion 1991
zetta Z 10007 1021 1000000000000000000000 Sextillion Trilliard 1991
exa E 10006 1018 1000000000000000000 Quintillion Trillion 1975
peta P 10005 1015 1000000000000000 Quadrillion Billiard 1975
tera T 10004 1012 1000000000000 Trillion Billion 1960
giga G 10003 109 1000000000 Billion Milliard 1960
mega M 10002 106 1000000 Million 1960
kilo k 10001 103 1000 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 0.000001 Millionth 1960
nano n 1000−3 10−9 0.000000001 Billionth Milliardth 1960
pico p 1000−4 10−12 0.000000000001 Trillionth Billionth 1960
femto f 1000−5 10−15 0.000000000000001 Quadrillionth Billiardth 1964
atto a 1000−6 10−18 0.000000000000000001 Quintillionth Trillionth 1964
zepto z 1000−7 10−21 0.000000000000000000001 Sextillionth Trilliardth 1991
yocto y 1000−8 10−24 0.000000000000000000000001 Septillionth Quadrillionth 1991
  1. ^ The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.

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Podcasts:

PLAYLIST TIME:

7 Days, 7 Weeks

by: Deus

Sister love, why don't you break it up?
You got to let someone look into your heart
Sister love, how do you keep it up?
If you don't let no-one look into your heart
As a kid, you couldn't live it up
You were so serious but always so smart
As a kid, you couldn't keep it up
And we were never close, so much apart
Here comes the sun smiling
How long have you been blue?
There'd ever be a time for us to recapture
All the time we lose
There was a time when you were being so proud
Could have been anythin' that you aspired
There was a time when you were never around
When somethin' good happened, somethin' good happened right
So sister love, I'll help you off the ground
You got to let someone look into your heart
You got to turn this situation around
You got to turn this, turn it around
Here comes the sun smiling
How long have you been blue?
There'd ever be a time for us to recapture
All the time we lose
'Cause it's plain to see
A storm is not the weather
And I'm telling you girl
You'll look at them and smile
I'm telling you girl
You'll look at them and smile
7 days you should be givin' yourself
All your belongings, all that you treasure
7 weeks you think of nobody else
Is this what you want, is this what you are?
How did it come this far?
Here comes the sun smilin'
The only thing that's true
There'd ever be a time for us to recapture
All the time we lose
'Cause it's plain to see
A storm is not the weather
And I'm telling you girl
You'll look at them and smile
And I'm telling you girl
You'll look at them and smile
And I'm telling you girl
You'll look at them and smile
And I'm telling you girl




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