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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:

vs = 643.855 x (T/273.15)0.5

Where:

vs = 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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