The speed of sound calculator displays a speed of sound in water, It's 4672 ft/s. In dry air at 20 Â°C (68 Â°F), the speed of sound is 343.2 metres per second (1,126 ft/s; 1,236 km/h; 768 mph; 667 kn), or a kilometre in 2.914 s or a mile in 4.689 s. In common everyday speech, speed of sound refers to the speed of sound waves in air. Note: 10 kPa = 1 dbar is close to the pressure increase that corresponds to a depth increase of 1 m. You can use this calculator to determine the Mach number of a rocket at a given speed and altitude on Earth or Mars. You could tackle the complexities of a formula yourself, or you could use a speed of sound calculator. For example (as noted above), sound travels at 343.2 m/s in air; it travels at 1,484 m/s in water(4.3 times as fast as in air); and at 5,120 m/s in iron. The high-pressure regions are called compressions and the low-pressure regions are called rarefactions. Learn How to Use a Speed of Sound Calculator Let’s say you want to find out how sound travels in icy cold water. Thank you for your questionnaire.Sending completion.  2019/02/14 04:47 Male / 60 years old level or over / A retired person / Very /,  2018/10/18 00:43 Male / 50 years old level / Others / A little /,  2018/01/11 02:35 Male / 30 years old level / High-school/ University/ Grad student / Useful /,  2017/11/14 13:59 Male / 50 years old level / A retired people / Very /,  2017/05/03 20:27 Female / 20 years old level / High-school/ University/ Grad student / - /,  2017/05/03 15:16 Female / 20 years old level / High-school/ University/ Grad student / Useful /,  2017/04/14 14:42 Male / 20 years old level / Elementary school/ Junior high-school student / Very /,  2017/02/17 14:49 Female / 30 years old level / High-school/ University/ Grad student / Useful /,  2016/05/12 23:41 Male / 60 years old level or over / Self-employed people / Useful /,  2016/03/23 00:24 Male / 30 years old level / Self-employed people / Very /.