Database Management
Reference Manual
Attributes
:
Real Attributes of Physical Quantities
: SI Unit Prefixes
SI Unit Prefixes
Any unit may have an SI unit prefix preceding it which can be applied either directly (as in hectogramme) or with an intervening underscore (hecto_gramme).
Unlike the units themselves the SI prefix cannot be abbreviated as it would introduce too much syntax ambiguity.
Many standard units actually incorporate the SI prefix in them (mm, cm, kg) these are still standard units so it is actually (although misleadingly) possible to duplicate this as in millikg (which is, equivalent to a gram).
The system does not forbid use of SI prefixes with imperial units, although, this is not to be encouraged.
The set of prefixes supported are:
Prefix
Multiplier
Exa
1E+18
Peta
1E+15
Tera
1E+12
Giga
1E+09
Mega
1000000
kilo
1000
hecto
100
deca
10
deci
0.1
centi
0.01
milli
0.001
micro
0.000001
nano
1E-09
pico
1E-12
femto
1E-15
1974 to current year.
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