When working with short sound waves there are sometimes waves that are 0.23 milliseconds of a second and even lower 0.041 milliseconds of a second. In seconds they are 0.00023 sec. and 4.1e-5 sec. They are also 230 microseconds and 41 microseconds of a millisecond.

How do we pronounce these fractions?

A second has 1000 milliseconds. A millisecond has 1000 microseconds.

  • 3
    I think that you're a little bit confused here. You can't say 0.23 milliseconds of a second. You can say 0.23 milliseconds, or 0.23 thousandths of a second.
    – JavaLatte
    Apr 18, 2017 at 13:17
  • When you ask "How do we pronounce these fractions?", are you looking for something like "zero-point-zero-four-one milliseconds"? Or are you asking about the "milliseconds of a second" part?
    – user3169
    Apr 19, 2017 at 1:36

1 Answer 1


None of the figures you listed here require "of a second/millisecond". Because a millisecond and a microsecond are their units of measure, they can stand alone.

You would use "of a second" when refer to expressions of partiality. For instance, you might say a third of a second. A thousandth of a second (which is a millisecond, anyways).

You can just use milliseconds/microseconds.


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