There's no such thing as a maicrosecond.
There is a microsecond which 1,000,000 microseconds makes one second.
There is only one second in one second.
72pulse for one second
1000
3600 second in one hour.
One arc second is one 3600th of a degree.
1 second, because one squared is still one, therefore, one second squared is still one.
1,000 milliseconds in one second.
1 second = 1000000000 nanoseconds
1,000,000,000 109 one billion
One micro second
There are 1,000 milliseconds in one second.
1024