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nano pico femto atto zepto yocto ronto quecto; Prefix symbol d c m μ n p f a z y r q ... kilo mega giga tera peta exa zetta yotta ronna quetta; Prefix symbol da h k ...
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic.Each prefix has a unique symbol that is prepended to any unit symbol.
Prefix Symbol Factor Power 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) (none) 1 10 0: deci d 0.1 10 −1 ...
Engineering notation or engineering form (also technical notation) is a version of scientific notation in which the exponent of ten is always selected to be divisible by three to match the common metric prefixes, i.e. scientific notation that aligns with powers of a thousand, for example, 531×10 3 instead of 5.31×10 5 (but on calculator displays written without the ×10 to save space).
The order of magnitude of data may be specified in strictly standards-conformant units of information and multiples of the bit and byte with decimal scaling, or using historically common usages of a few multiplier prefixes in a binary interpretation which has been common in computing until new binary prefixes were defined in the 1990s..
An electron's mass is about 0.000 000 000 000 000 000 000 000 000 000 910 938 356 kg. [20] In scientific notation, this is written 9.109 383 56 × 10 −31 kg. The Earth's mass is about 5 972 400 000 000 000 000 000 000 kg. [21] In scientific notation, this is written 5.9724 × 10 24 kg. The Earth's circumference is approximately 40 000 000 m. [22]
The kilogram is the only standard unit to include an SI prefix (kilo-) as part of its name. The gram (10 −3 kg) is an SI derived unit of mass. However, the names of all SI mass units are based on gram, rather than on kilogram; thus 10 3 kg is a megagram (10 6 g), not a *kilokilogram.
Nano (symbol n) is a unit prefix meaning one billionth. Used primarily with the metric system , this prefix denotes a factor of 10 −9 or 0.000 000 001 . It is frequently encountered in science and electronics for prefixing units of time and length .