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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
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| 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
|
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+25
|
346.13
|
1.1839
|
409.4
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+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
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|
0
|
331.30
|
1.2922
|
428.0
|
|
−5
|
328.25
|
1.3163
|
432.1
|
|
−10
|
325.18
|
1.3413
|
436.1
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−15
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322.07
|
1.3673
|
440.3
|
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−20
|
318.94
|
1.3943
|
444.6
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|
−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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