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Constants library

3 values, each with its units, its uncertainty, and where it came from.

Material Properties 3

Speed of Sound in Dry Air at 20 °C measured

cair=343.2 m/sc_{\mathrm{air}} = 343.2\ \text{m/s}

m/sSpeed of sound in dry air at 20 °C and 1 atm, 343 m/s or 1125 ft/s — set by temperature, essentially not by pressure.

Speed of Sound in Water at 20 °C measured

cw=1482 m/sc_{w} = 1482\ \text{m/s}

m/sSpeed of sound in fresh water at 20 °C and 1 atm, about 1482 m/s — 4.3 times faster than in air, and rising with temperature.

Speed of Sound in Steel measured

csteel=5900 m/sc_{\mathrm{steel}} = 5900\ \text{m/s}

m/sLongitudinal (bulk) wave speed in carbon steel, about 5900 m/s; the thin-bar wave speed √(E/ρ) is lower, near 5100 m/s.