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Mega- (symbol M) is an SI prefix in the SI system of units denoting a factor of 10^{6}, 1,000,000 (one million).

For example, 1 MW (megawatt) = 1,000,000 watts = 1,000 kilowatts.

Confirmed in 1960, it comes from the Greek μέγας, meaning great.

- one megaton [of TNT] (a unit often used in measuring the explosive power of nuclear weapons) is 1,000,000 tons of TNT.
- megahertz—frequency of electromagnetic radiation for radio and television broadcasting, GSM, etc. 1 MHz = 1,000,000 Hz.

- 1 Mm
^{2}means one square megametre or the size of a square of 1,000,000 m × 1,000,000 m or $10^\{12\}$ m^{2}(and not 1,000,000 × a square metre or $10^\{6\}$ m²) - 1 Mm
^{3}means one cubic megametre or the size of a cube of 1,000,000 m × 1,000,000 m × 1,000,000 m or $10^\{18\}$ m^{2}(and not 1,000,000 × a cubic metre or $10^\{6\}$ m^{3})

The prefix mebi- has been suggested as a prefix for 2^{20} to avoid ambiguity, but is yet to be widely used.

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Last updated on Wednesday October 08, 2008 at 19:36:03 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Wednesday October 08, 2008 at 19:36:03 PDT (GMT -0700)

View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation

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