Related Resources: physics

Speed of Sound Table Chart

Speed of Sound table chart including Speed of Sound at a known temperature and density of air, Speed of Sound vs Density of Air .

Speed of Sound Equation:

v s = 643.855 x (T/273.15)0.5

Where:

v s = Speed of Sound (knots)

T = temperature (Kelvin)

Speed of Sound at a known temperature and density of air

Altitude Temperature Speed of Sound Feet (ft) Meter (m) Celcius (°C) Kelvin (K) mph knots km/h m/s 0 (sea level) 0 (sea level) 15 288 761.1 661 1,225 340.3 5,000 1524 5.1 278 747.9 650 1,204 334.4 10,000 3048 -4.8 268 734.5 638 1,182 328.4 15,000 4572 -14.7 258 720.8 626 1,160 322.2 20,000 6096 -24.6 248 706.9 614 1,138 316.0 25,000 7620 -34.5 239 692.6 602 1,115 309.6 30,000 9144 -44.4 229 678.1 589 1,091 303.1 35,000 10668 -56.0 217 660.7 574 1,063 295.4 40,000 12192 -56.6 216 659.8 573 1,062 294.9 45,000 13716 -56.6 216 659.8 573 1,062 294.9 50,000 15240 -56.6 216 659.8 573 1,062 294.9 55,000 16764 -56.6 216 659.8 573 1,062 294.9 60,000 18288 -56.6 216 659.8 573 1,062 294.9

Speed of Sound vs Density of Air

Effect of temperature on properties of air

Temperature

T ( °C ) Speed of sound

c ( m · s −1 ) Density of air

ρ ( kg · m −3 ) specific acoustic impedance

z 0 ( Pa · m −1 · s ) +35 351.88 1.1455 403.2 +30 349.02 1.1644 406.5 +25 346.13 1.1839 409.4 +20 343.21 1.2041 413.3 +15 340.27 1.2250 416.9 +10 337.31 1.2466 420.5 +5 334.32 1.2690 424.3 0 331.30 1.2922 428.0 −5 328.25 1.3163 432.1 −10 325.18 1.3413 436.1 −15 322.07 1.3673 440.3 −20 318.94 1.3943 444.6 −25 315.77 1.4224 449.1

Given normal atmospheric conditions, the temperature, and thus speed of sound, varies with altitude:

Altitude Temperature m·s −1 km·h −1 mph knots Sea level 15 °C (59 °F) 340 1225 761 661 11,000 m−20,000 m

(Cruising altitude of commercial jets,

and first supersonic flight ) −57 °C (−70 °F) 295 1062 660 573 29,000 m (Flight of X-43A ) −48 °C (−53 °F) 301 1083 673 585

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