Deci-
From HandWiki
Deci- (symbol d) is a decimal unit prefix in the metric system denoting a factor of one tenth. Proposed in 1793,[1] and adopted in 1795, the prefix comes from the Latin decimus, meaning "tenth". Since 1960, the prefix is part of the International System of Units (SI).[2][3]
A frequent use of the prefix is in the unit deciliter (dl), common in food recipes; many European homes have a deciliter measure for flour, water, etc. A common measure in engineering is the unit decibel for measuring ratios of power and root-power quantities, such as sound level and electrical amplification.
- Example
- The diameter of a compact disc is about 12 centimetres or 1.2 decimetres.[4]
Prefix | Base 10 | Decimal | English word | Adoption[nb 1] | |||
---|---|---|---|---|---|---|---|
Name | Symbol | Short scale | Long scale | ||||
yotta | Y | 1024 | 1000000000000000000000000 | septillion | quadrillion | 1991 | |
zetta | Z | 1021 | 1000000000000000000000 | sextillion | trilliard | 1991 | |
exa | E | 1018 | 1000000000000000000 | quintillion | trillion | 1975 | |
peta | P | 1015 | 1000000000000000 | quadrillion | billiard | 1975 | |
tera | T | 1012 | 1000000000000 | trillion | billion | 1960 | |
giga | G | 109 | 1000000000 | billion | milliard | 1960 | |
mega | M | 106 | 1000000 | million | 1873 | ||
kilo | k | 103 | 1000 | thousand | 1795 | ||
hecto | h | 102 | 100 | hundred | 1795 | ||
deca | da | 101 | 10 | ten | 1795 | ||
100 | 1 | one | – | ||||
deci | d | 10−1 | 0.1 | tenth | 1795 | ||
centi | c | 10−2 | 0.01 | hundredth | 1795 | ||
milli | m | 10−3 | 0.001 | thousandth | 1795 | ||
micro | μ | 10−6 | 0.000001 | millionth | 1873 | ||
nano | n | 10−9 | 0.000000001 | billionth | milliardth | 1960 | |
pico | p | 10−12 | 0.000000000001 | trillionth | billionth | 1960 | |
femto | f | 10−15 | 0.000000000000001 | quadrillionth | billiardth | 1964 | |
atto | a | 10−18 | 0.000000000000000001 | quintillionth | trillionth | 1964 | |
zepto | z | 10−21 | 0.000000000000000000001 | sextillionth | trilliardth | 1991 | |
yocto | y | 10−24 | 0.000000000000000000000001 | septillionth | quadrillionth | 1991 | |
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References
- ↑ Commission temporaire de Poids & Mesures rêpublicaines, En exécution des Décrets de la Convention Nationale (1793) (in fr). Instruction abrégée sur les mesures déduites de la grandeur de la Terre; uniformes pour toute la Rêpublique, et sur les Calculs relatifs à leur division décimale (Edition originale ed.). Paris, France: De l´imprimerie nationale exécutive du Louvre. https://archive.org/details/instructionabreg00hauy. Retrieved 2015-10-09.
- ↑ The International System of Units (Si): The Metric System. DIANE Publishing. 1992. p. 30. ISBN 9780941375740. https://books.google.com/books?id=y2-BDaoBVnwC&dq=si+derived+units+1960&pg=PA30.
- ↑ "Resolution 12 of the 11th CGPM". BIPM. 1960. https://www.bipm.org/en/CGPM/db/11/12/.
- ↑ "Universcale: From the nanoworld to the universe — The worlds we measure using our infinite yardstick.". Nikon. 2013. https://www.nikon.com/about/sp/universcale/.
Original source: https://en.wikipedia.org/wiki/Deci-.
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