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Mega is a unit prefix in metric systems of units denoting a factor of one million (10 6 or 1 000 000). It has the unit symbol M . It was confirmed for use in the International System of Units (SI) in 1960.
Before the adoption of ronna and quetta for 10 27 and 10 30 and ronto and quecto for 10 −27 and 10 −30 in November 2022, many personal, and sometimes facetious, proposals for additional metric prefixes were formulated. [12] [13] The prefix bronto, as used in the term "brontobyte", has been used to represent anything from 10 15 to 10 27 ...
For example, 5 km is treated as 5000 m, which allows all quantities based on the same unit to be factored together even if they have different prefixes. A prefix symbol attached to a unit symbol is included when the unit is raised to a power. For example, 1 km 2 denotes 1 km × 1 km = 10 6 m 2, not 10 3 m 2.
10 −5: 10 μHz ~11.57 μHz: Daily (or Earth's rotation frequency) 10 −4: 100 μHz ~277.8 μHz: Hourly 10 −2: 1 centihertz (cHz) ~16.667 mHz: One rpm: 10 −1: 1 decihertz (dHz) 189 mHz: Acoustic – frequency of G −7, the lowest note sung by the singer with the deepest voice in the world, Tim Storms. His vocal cords vibrate 1 time every ...
mega-, a metric prefix denoting 10 6; Mega (number), a certain very large integer in Steinhaus–Moser notation "mega-" a prefix meaning "large" that is used in taxonomy; Gravity assist, for Moon-Earth gravity assist and Mars-Earth gravity assist
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 ...
Visualisation of powers of 10 from one to 1 trillion. In mathematics, a power of 10 is any of the integer powers of the number ten; in other words, ten multiplied by itself a certain number of times (when the power is a positive integer). By definition, the number one is a power (the zeroth power) of ten. The first few non-negative powers of ...
As 1024 (2 10) approximates 1000 (10 3), roughly corresponding to the SI prefix kilo-, it was a convenient term to denote the binary multiple. In 1999, the International Electrotechnical Commission (IEC) published standards for binary prefixes requiring the use of megabyte to denote 1000 2 bytes, and mebibyte to denote 1024 2 bytes.