There are 60 seconds in a minute and 60 minutes in an hour. To determine the fraction of an hour that a second represents, we need to divide the number of seconds in an hour by the total number of seconds.
Number of seconds in an hour = 60 seconds/minute * 60 minutes/hour = 3,600 seconds
Therefore, the fraction of an hour that a second represents is:
1 second / 3,600 seconds = 1/3600
So, a second represents 1/3600th of an hour.