词条	Attenuation of sound in selected fluids
释义	Attenuation of sound in selected fluids Table Attenuation of sound in selected fluids fluid attenuation coefficient helium 52.5 hydrogen 16.9 nitrogen 133.0 oxygen 165.0 air 137.0 carbon dioxide 140.0 water, at 0 °C (32 °F) 0.569 water, at 20 °C (68 °F) 0.253 water, at 80 °C (176 °F) 0.079 mercury, at 25 °C (77 °F) 0.057 methyl alcohol, at 30 °C (86 °F) 0.302 See as table:
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