Units, Conversions
The International System of Units (abbreviated SI from
French: Système international d'unités) is the modern
form of the metric system and is generally a system of units
of measurement devised around seven base units and the
convenience of the number ten. The older metric system
included several groups of units. The SI was established in
1960, based on the metre-kilogram-second system, rather than
the centimetre-gram-second system, which, in turn, had a few
variants. The SI is declared as an evolving system, thus
prefixes and units are created and unit definitions are
modified through international agreement as the technology
of measurement progresses, and as the precision of
measurements improves.
If there is one thing you need to learn, it's metric
prefixes. You will use them in a variety of ways the
rest of your life, no matter what you do. At least the
most common ones such as k,M,G and c,m,µ.
SI (metric) prefixes:
da (deca) = x10 (rarely used)
h (hecto) = x100 (rarely used)
k (kilo) = x1000 = e3
M (Mega) = x1000000 = e6
G (Giga) = x1000000000 = e9
T (Tera) = x1000000000000 = e12
P (Peta) = e15
E (Exa) = e18
Z (Zetta) = e21
Y (Yotta) = e24
d (deci) = /10 = e-1 (rarely used)
c (cent) = /100 = e-2 (rarely used except for cm)
m (milli) = /1000 = e-3
µ (micro) = /1000000 = e-6
n (nano) = /1000000000 = e-9
p (pico) = /1000000000000 = e-12
f (femto) = e-15
a (atto) = e-18
z (zepto) = e-21
y (yocto) = e-24
PS, you sometimes see kbyte for 1024 bytes or Mbyte
for 1024*1024 bytes or similar. That is not correct
usage. kbyte is 1000 bytes and Mbye is 1000000 bytes.
If you want to use a power of two factor, you need to
use a different prefix. Correct usage:
1 Kibyte = 1024 bytes
1 Mibyte = 1024² bytes = 1024 Kibytes = 1048576 bytes
1 Gibyte = 1024³ bytes = 1024 Mibytes = 1048576 Kibyte
= 1073741824 bytes
http://en.wikipedia.org/wiki/Metric_prefixes
Volume units
100000 L = 100 m³
10000 L = 10 m³
1000 L = 1 m³ = 1000 dm³
100 L = 0.1 m³ = 100 dm³
10 L = 10000 cm³ = 0.01 m³ = 10 dm³
1 L = 1000 mL = 1000 cm³ = 0.001 m³ = 1 dm³
0.1 L = 100 mL = 100 cm³ = 0.0001 m³ = 0.1 dm³
0.01 L = 10 mL = 10 cm³ = 0.00001 m³ = 0.01 dm³
0.001 L = 1 mL = 1 cm³ = 0.000001 m³ = 0.001 dm³
1 mL = 1000µL = 1000 mm³ = 1 cm³ = 0.000001 m³
0.1 mL = 100µL = 100 mm³ = 0.1 cm³
0.01 mL = 10µL = 10 mm³ = 0.01 cm³
0.001 mL = 1µL = 1 mm³ = 0.001 cm³
1 µL = 1000 nL = 1 mm³ = 100000 µm³
0.1 µL = 100 nL = 0.1 mm³ = 10000 µm³
0.01 µL = 10 nL = 0.01 mm³ = 1000 µm³
0.001 µL = 1 nL = 0.001 mm³ = 100 µm³
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