Decibel levels are not additive. That is, if a machine is operating at 100 dB and a second machine is switched on at 80 dB, the noise level in the room remains 100 dB, not 180 dB (the sound intensity increases, but not the actual noise level).
Boru
Boru
‘I can’t be having with this.’ - Esmeralda Weatherwax
