<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> A microsecond is an SI unit of time equal to one millionth (0.000001 or 10 or /) of a second . Its symbol is μs . </P> <P> A microsecond is equal to 1000 nanoseconds or / milliseconds . Because the next SI prefix is 1000 times larger, measurements of 10 and 10 seconds are typically expressed as tens or hundreds of microseconds . A microsecond of sound signal sample (44.1 kHz, 2 channel, 24 bit, WAV) is typically stored on 4 μm of CD, 2 bits per μs per 4 μm . </P>

How many micro seconds are in a second
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