Sound Pressure Level (SPL)

Sound Pressure Level (SPL) measures the intensity or loudness of sound, expressed in decibels (dB). It quantifies the pressure variations caused by sound waves relative to a reference level, typically the quietest sound the average human ear can detect. A higher SPL indicates a louder sound, such as a whisper (~30 dB), normal conversation (~60 dB), or a rock concert (~120 dB). SPL provides a standardized way to assess and compare the loudness of different sounds, which is important in fields like acoustics, audio engineering, and hearing health.