What is the approximate speed of sound at sea level on a standard day?

The speed of sound at sea level on a standard day is approximately 661 knots or 340 meters per second. This value is based on the specific atmospheric conditions defined by the International Standard Atmosphere (ISA), which assumes a temperature of 15 degrees Celsius (59 degrees Fahrenheit) at sea level.

At this temperature, the speed of sound is influenced by both the temperature and the density of the air. As the temperature increases, the speed of sound also increases, while cooler temperatures result in a lower speed of sound. The value of 661 knots is commonly accepted and used as a reference point in aviation for calculations involving aircraft performance and maneuvers.

Understanding the speed of sound is essential for pilots and aviation mechanics when considering airspeed, transonic flight, and supersonic travel, making this knowledge crucial for effective operations in the aviation field.