Trillionth: Difference between revisions
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==Long scale countries== |
==Long scale countries== |
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In most European countries, a trillionth is equal to 0.000 000 000 000 000 001, or 1 x 10<sup>-18</sup> in [[scientific notation]]. The prefix for a number of this magnitude is [[atto]] , and is abbreviated as lowercase a. |
In most European countries, a trillionth is equal to 0.000 000 000 000 000 001, or 1 x 10<sup>-18</sup> in [[scientific notation]]. The prefix for a number of this magnitude is [[atto-|atto]] , and is abbreviated as lowercase a. |
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Revision as of 09:25, 25 October 2011
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One trillionth is the reciprocal of a trillion, which means it has one of two definitions depending on whether the long scale or short scale numbering system is in use.
Short scale countries
In most English-speaking countries, a trillionth is equal to 0.000 000 000 001, or 1 x 10-12 in scientific notation. The prefix for a number of this magnitude is pico (pronounced "peeko"), and is abbreviated as lowercase p.
Long scale countries
In most European countries, a trillionth is equal to 0.000 000 000 000 000 001, or 1 x 10-18 in scientific notation. The prefix for a number of this magnitude is atto , and is abbreviated as lowercase a.
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