Sound is actually short for sound pressure level, or SPL, Steve Orfield said. It is measured in decibels, or dB, around which there are misconceptions. A few facts: • Zero decibels is not the absence ...
The Chinese capital will spend 1 billion yuan (US$120 million) on traffic noise control in the next five years, aimed at curbing the level to under 68 decibels by 2007. Sixty-eight decibels is equal ...
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