Speed of Sound
c = 331.4 × √(1 + T_celsius / 273.15) [m/s]
Or approximately:
c ≈ 331.4 + 0.606 × T_celsius [m/s]
| Temperature | Speed of Sound |
|---|---|
| 0°C (32°F) | 331 m/s |
| 10°C (50°F) | 337 m/s |
| 20°C (68°F) | 343 m/s |
| 30°C (86°F) | 349 m/s |
| 40°C (104°F) | 355 m/s |
Inches per millisecond (useful for time alignment):
c = 13,500 in/s = 13.5 in/ms
Delay per inch of distance difference:
t = 1 / 13.5 = 0.074 ms per inch