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UCUM Symbol Factor Power yotta Y 1 000 000 000 000 000 000 000 000: 10 24: zetta Z 1 000 000 000 000 000 000 000: 10 21: exa E 1 000 000 000 000 000 000: 10 18: peta P 1 000 000 000 000 000: 10 15: tera T 1 000 000 000 000: 10 12: giga G 1 000 000 000: 10 9: mega M 1 000 000: 10 6: kilo k 1 000: 10 3: hecto h 100 10 2: deca da 10 10 1 (none ...
[1]: 143–144 [7] [8] [9] Most prefixes correspond to integer powers of 1000; the only ones that do not are those for 10, 1/10, 100, and 1/100. The conversion between different SI units for one and the same physical quantity is always through a power of ten.
U+2113 ℓ SCRIPT SMALL L; "despite its character name, this symbol is derived from a special italicized version of the small letter l". [6] It has various other specialized uses, such as a liter symbol and as the azimuthal quantum number symbol. U+2118 ℘ SCRIPT CAPITAL P is a symbol for Weierstrass's elliptic function. [7]
1.2 × 10 2: tech: electric power output of 1 m 2 solar panel in full sunlight (approx. 12% efficiency), at sea level 1.3 × 10 2: tech: peak power consumption of a Pentium 4 CPU 2 × 10 2: tech: stationary bicycle average power output [17] [18] 2.76 × 10 2: astro: fusion power output of 1 cubic meter of volume of the Sun's core. [19] 2.9 × 10 2
Volume Unit of measure cubic metre litre Reference size Usage 1 cubic metre = 1 = 1000: base unit in SI : 1 barrel = 0.158 987 294 928 = 158.987294928 = 42 US gallons = 9,702 cubic inches
The Bubble Nebula (NGC 7635) at left with about 520 cubic light years (4.4 × 10 50 m 3) dwarfs the Dumbbell Nebula's 12 cubic light years (1 × 10 49 m 3) (very approximate figures) The globular cluster Messier 5 at upper left with about 2 million cubic light years (1.7 × 10 54 m 3) dwarfs the much smaller Bubble Nebula at lower right.
To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimeters; 1 cm – 0.39 inches; 1 cm – edge of a square of area 1 cm 2; 1 cm – edge of a cube of volume 1 mL; 1 cm – length of a coffee bean; 1 cm – approximate width of average fingernail
The SI has special names for 22 of these coherent derived units (for example, hertz, the SI unit of measurement of frequency), but the rest merely reflect their derivation: for example, the square metre (m 2), the SI derived unit of area; and the kilogram per cubic metre (kg/m 3 or kg⋅m −3), the SI derived unit of density.