A nanosecond
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nano- means 10^-9 or one billionth.
Seconds. A nanosecond is a billionth of a second, or 10-9 seconds.
One billionth of one millionth in the US is 1 x 10-15. In the UK it is 1 x 10-18.
1 billionth = 10-9 (1 billionth)4 = (10-9)4 = 10-36 That's 0.000 000 000 000 000 000 000 000 000 000 000 001
billionth is 1,000,000,000 millionth is 1000000