This blog is a definition of some of the terms I have been using in previous blogs and that I will use in future blogs.
Sound Pressure Level
Sound, or noise, is the term given to the variations in air pressure of which are capable of being heard. Tiny imbalances in atmospheric pressure is the thing that is measured by a sound level meter. Because humans can detect changes in atmospheric pressure over a huge range, sound pressure is measured on a logarithmic scale in decibels (dB). Noise means “unwanted” sound.