Deca-

SI

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, Czech, Slovak, and Hungarian, deka (or deko) is common, and used in self-standing form, always meaning decagram. A runway number typically indicates its magnetic azimuth 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., UK and Austria), D (e.g., Germany, Eastern Europe), 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.

• 1 decametre = 10 metres
• 1 decalitre = 10 litres
• 1 decare = 10 ares

Examples:

• The blue whale is approximately 30 metres or 3 decametres in length.

As an English prefix

The prefix is used in many words.

General

• Decathlon, a combined event in athletics consisting of ten track and field events.
• Decennial, ten-yearly or a celebration of ten years.

Mathematics

• Decimal based on the number ten.
• Decagon a plane figure with ten sides
• Decahedron a polyhedron with ten faces

Chemistry

• Decane, a hydrocarbon with 10 carbon atoms

Biology

• Decapoda, an order of crustaceans with ten feet

Religion

• The Decalogue, the Ten Commandments

Notes

References

References

1. (1979). "Chambers Twentieth Century Dictionary".
2. [https://www.bipm.org/en/publications/si-brochure/chapter3.html ''Decimal multiples and submultiples of SI units''] {{Webarchive. link. (2019-03-30 , 2006, SI Brochure: The International System of Units (SI), 8th edition)
3. [http://physics.nist.gov/Pubs/SP811/sp811.html ''Guide for the Use of the International System of Units (SI)''], 1995, NIST Special Publication 811
4. (December 1994). "HP 48G Series – User's Guide (UG)". [[Hewlett-Packard]].
5. (2006-04-01). "HP 50g graphing calculator user's guide (UG)". [[Hewlett-Packard]].
6. (October 2014). "HP Prime Graphing Calculator User Guide (UG)". [[Hewlett-Packard Development Company, L.P.]].
7. "National Geographic TV Shows, Specials & Documentaries".