the Unit to measure loudness
The unit to measure loudness is the decibel (dB). The loudness of different sounds is compared using this unit. For example, a whisper is about 10-20 decibels, a normal conversation is about 60-70 decibels, and a hairdryer is about 80-90 decibels.
If a rock concert is louder than a hairdryer, then how loud do you think the concert is in decibels?