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•Sound can be measured in many ways such as decibels. There is a special machine which you can by that measures how many decibels something makes. A pin makes 10 decibels where as a loud persons or a stereo can make up to 80 decibels. Volume is measured in decibels. So Frequency is measured in hertz
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Mach 1 is the speed of sound. 768 miles per hr. Mach 2 is twice that & so on.
The usual symbol for decibels is dB.