Definition and examples. The

**decibel**(**dB**) is used to measure sound**level**, but it is also widely used in electronics, signals and communication. The**dB**is a logarithmic way of dscribing a ratio. The ratio may be power, sound pressure, voltage or intensity or several other things.Thereof, how much louder is 3db?

Doubling of the volume (loudness) should be sensed as a level difference of +10 dB − acousticians say. Doubling of sound intensity (acoustic energy) belongs to a calculated level change of +3 dB. +10 dB is the level of twice the perceived volume or twice as

**loud**(loudness) in psychoacoustics − mostly sensed.How do decibels increase?

On a ruler, a distance of 20cm is twice as long as a distance of 10cm and 30cm is three times as long. But the logarithmic

**decibel**scale goes up in powers of ten: every**increase**of 10dB on the scale is equivalent to a 10-fold**increase**in sound intensity (which broadly corresponds with a doubling in loudness).