A decibel is an unit for relative loudness. The decibel scale is a logarithmic scale. In order to move up by the same amount from any starting point, you don't add the same amount, you multiply.
IMC pencil sharpener: 81.5 dB
Paper towel: 83.3 dB
Vent fan in nurse's bathroom: 60.9 dB
Door closing: 73.8 dB
Water fountain: 56.8 dB
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