One millionth of a second is called a microsecond (as can be found at College and Graduate School of Arts and Sciences, Boston University http://www.cs.bu.edu/faculty/snyder/cs210/Units.htm). There is some conjecture that the correct answer to this question could also be a billisecond (in that in Imperial Measure milli means one thousandth and billi means one millionth).
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Too short! But a nanosecond is one billionth of a second.
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Writing one-millionth as an exponent, we have:
10-6 x 10-6 = 10-12
which is one-trillionth. Such a fraction of a second would be a "picosecond."
A nanosecond, or one-billionth of a second, is 10-9 seconds.
A millionth of a meter is called a micrometer, often abbreviated as "micron".A millionth of a meter is called a micrometer, often abbreviated as "micron".A millionth of a meter is called a micrometer, often abbreviated as "micron".A millionth of a meter is called a micrometer, often abbreviated as "micron".
nanometer
One billionth of one millionth in the US is 1 x 10-15. In the UK it is 1 x 10-18.
Microgram
One microsecond is equal to one millionth (1e-6) of a second).