Deca-

It has been suggested that Deca- (prefix) be merged into this article. (Discuss) Proposed since February 2024.

Deca (

) meaning ten.

The prefix was a part of the original metric system in 1795. It is not in very common usage, although the deca

. 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 .

Before the symbol as an

• 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.^[6]

SI prefixes

• v
• t
• e

Prefix		Base 10	Decimal	Adoption [nb 1]
Name	Symbol
quetta	Q	1030	1000000000000000000000000000000	2022[7]
ronna	R	1027	1000000000000000000000000000
yotta	Y	1024	1000000000000000000000000	1991
zetta	Z	1021	1000000000000000000000
exa	E	1018	1000000000000000000	1975[8]
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[7]
quecto	q	10−30	0.000000000000000000000000000001
Notes ^ Prefixes adopted before 1960 already existed before SI. The introduction of the CGS system was in 1873.

See also

• Metric prefix

References

External links

Look up deca- in Wiktionary, the free dictionary.

• BIPM website