Ah, what a lovely question! One millionth of a million is called a trillion. Isn't that just a beautiful number to think about? Just imagine all the possibilities and beauty that number holds within it.
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Oh, dude, you're asking about one millionth of a million? That's like asking for a crumb of a crumb of a crumb of a cookie! Anyway, that tiny fraction is called a micro. So, a millionth of a million is a micro of something, like a microsecond or a microgram.
One millionth of a million is called a micro. It's like trying to find a needle in a haystack, but on a much smaller scale. So, next time you need to talk about something super tiny, just drop the word "micro" and sound like a science whiz.
A second! 1 = Ten tenths = Hundred hundredths = Thousand thousandths etc. A millionth of a millionth of a second, or 1/(1million x 1 million) seconds, is called a picosecond. 1/(1 million) seconds, or one millionth of a second, is called a microsecond. 1/(1000 x 1million) seconds, or one thousandth of a microsecond, is called a nanosecond.
The term micro is used to mean one millionth, so one millionth of a million is one. No zeroes.
One hundred-millionth of a centimetre is one millionth of a meter called a micrometer and written with the Greek *mju* character: µ
0,000001 One millionth micro
a millionth of a meter is a micrometer, most often called a micron