A high pitch sound has a high frequency and makes the air vibrate quickly , so the wave peaks are closer together. A low pitch sound makes the air particles vibrate more slowly and so the peaks ...

This is because a wave devouring propulsion system (WDPS) operates at a lower frequency compared with ... enhance ship stability by significantly decreasing pitch and heave motion, and reduce ...

So sound waves move slower through it, which amplifies the lower frequencies in your voice. But here's the fascinating thing. The pitch of your voice hasn't changed when you inhale either gas ...