Sound is measured in decibels. Unlike other measurements (for example measurements of length), decibels are not measurements of quantity but rather measurements of ratio. Each decibel increase represents an increase in the ratio (by a log of ten) of the louder sound to the softer one. The decibel system begins at 0 decibels which is the softest sound that can be heard. A sound of ten decibels is ten times louder than this threshold sound. A sound of twenty decibels is one hundred times louder. You can read more about decibels and see a chart comparing the loudness of various sounds here:
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