If you've ever seen a Jewish man with strings hanging out of his clothing, this is probably what you were seeing. There is no particular religious significance to the tallit (shawl) itself, other than the fact that it holds the tzitzit (fringes) on its corners.
Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa).
Decibels (dB) are a measurement of sound intensity over the standard threshold of hearing. dBA is sound intensity with an A contour filter. The filter adjusts the measurement to account for the way in which the ear responds to different frequencies of sound.hildren's hearing is more sensitive because the ear canal is smaller and sounds become louder as they develop in a smaller space. That can translate into as much as a 20 dB difference between an adult's ears and a child's ears which can cause a child's hearing to be damaged more easily.