Barrie : Règlement no 2006-140, art. 1(18) — Noise By-law

Overpressure The “overpressure” at a point due to an acoustic disturbance is the instantaneous difference at that point between the peak pressure during the disturbance and the ambient atmospheric pressure. The unit of measurement is the pascal. One pascal, abbreviated Pa, is the same as one newton per square meter, abbreviated N/m.