The velocity of sound in air under normal conditions is approximately 343 meters per second (m/s), or 767 miles per hour (mph).

"Normal conditions" typically refer to:

* Temperature: 20° Celsius (68° Fahrenheit)

* Atmospheric Pressure: 1 atmosphere (atm)

It's important to note that the speed of sound is affected by:

* Temperature: The speed of sound increases with temperature.

* Humidity: The presence of water vapor slightly increases the speed of sound.

* Altitude: The speed of sound decreases with altitude due to lower air density.

Let me know if you'd like more information about these factors!