Sound Levels
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Noise or sound levels are measured in decibels on the 'a' scale as mentioned earlier. The following table gives you an idea of what values on the scale mean in real life experience.

  Decibels     Typical Source         General Description

    10        soundproof room       threshold of audibility
    20        rustle of leaves            very faint
              whisper
    30        average auditorium            faint
              quiet conversation
    40        quiet radio, home
              or private office
    50        average office               moderate
              average conversation
    60        average factory
              noisy home
    70        average street noise           loud
              average radio
    80        police whistle
              noisy office
    90        noisy factory                very loud
              unmuffled truck
   100        boiler factory
              loud street noise
   110        nearby riviter               deafening
              elevated train
   120        thunder                  threshold of feeling
              artillery
      
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