Percutaneous endoscopic gastrostomy (PEG): A surgical procedure for placing a feeding tube without having to perform an open laparotomy (operation on the abdomen). The aim of PEG is to feed those who cannot swallow. PEG may be done by a surgeon, gastroenterologist (GI specialist).
While the intensity of a sound is a very objective quantity that can be measured with sensitive instrumentation, the loudness of a sound is more of a subjective response that will vary with a number of factors.
Doubling of the volume (loudness) should be sensed as a level difference of +10 dB â acousticians say. Doubling the sound pressure (voltage) corresponds to a measured level change of +6 dB â. Doubling of sound intensity (acoustic energy) belongs to a calculated level change of +3 dB.