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The loudness of a sound is measured by the size of its vibrations.
A 20dB sound is ten times louder than a 10dB sound; a 30dB sound is 100 times louder
than that.
0dB Human minimum audibility
30dB Soft whisper at 5m
50dB Inside urban home
55dB Light traffic at 15m
60dB Conversion at 1m
85dB Pneumatic drill at 15m
90dB Heavy traffic at 15m
100dB Loud shout at 15m
105dB Aeroplane take-off at 600m
117dB Inside full-volume disco
120dB Aeroplane take-off at 60m
130dB Pain Threhold for humans
140dB Aeroplane take-off at 30m
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