1. Open up Audacity. Load your audio clip.
  2. Now use the cursor to scroll over the shortest silence period in your clip. This is where a label will be inserted to show a break in audio parts. You are measuring the time.
  3. Look at the bottom of Audacity. You will see how long that silence period is.
  4. Now select all your audio clip by clicking Control + A.
  5. Now go to the Analyze menu.
  6. Choose Silence Finder
  7. In the minimum silence duration text box, type in the number you saw at the bottom of Audacity when you measured the shortest silence period in the clip.
  8. Click OK
  9. Now you will see a series of labels with a S. You can also manually enter labels (if the analyzer missed any spots) by clicking on the silence spot and pressing Control + B.
  10. Now that all your silence spots are marked to break up the clips, go to File and choose Export Multiple.
  11. Choose the format (wav, mp3), where to save it, how to name it, and choose Split based on labels.
  12. Click OK.

(I originally wrote this for the HRC blog: http://blogs.princeton.edu/hrc)

Note: If you need to delete a label, click on the label and backspace until all the letters or numbers are erased, then click enter (while the label is still selected).