Decibel charts give a visual representation of the relative loudness of various sounds, and they are often used to compare the dangers of sounds and potential hearing damage as the number of decibels increase. A decibel, also noted as dB, is a unit for measuring levels of sound pressure.
Because the decibal scale is logarithmic, a sound that is 10dB is 10 times louder than a sound that is 0db, and a sound that is 20dB is 100 times louder than a sound that is 0dB, and so on. Sound intensity doubles roughly every 3 decibels. Prolonged exposure to loud sounds can cause permanent hearing damage, and hearing protection is recommended for any sounds exceeding 85 decibels.