Frequently Asked Questions
How fast does sound travel in air?
About 343 m/s at 20°C. It varies with temperature: v ≈ 331.3·√(1 + T/273.15) m/s, so roughly +0.6 m/s per °C. It is ~1482 m/s in water and ~5960 m/s in steel.
Does humidity or pressure change it?
Temperature dominates. Humidity raises it slightly (humid air is less dense); pressure has almost no effect because density and stiffness change together.
What is Mach number?
Speed divided by the local speed of sound. Mach 1 is the sound speed; above it is supersonic. The tool computes Mach for a given speed and temperature.
How do I find distance from a sound delay?
Distance = speed × time. The classic lightning rule: count seconds to thunder and divide by ~3 for kilometers (or 5 for miles).
Why does sound travel faster in solids and water than in air?
Speed depends on how stiff a medium is relative to its density: v = √(E/ρ) in solids and √(K/ρ) in liquids. Solids and water are far stiffer than air, and stiffness rises much more than density does, so sound moves faster - about 4.3× faster in water and 17× faster in steel than in air, even though both are denser.
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Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.