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 If you want to use a power of two factor, you need to
use a different prefix. Correct usage:
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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