Noise and Hearing Conservation Program (소음과 청력보존 프로그램) - 4 ◈ Entities of Noise (소음의 본질) There are three entities of noise/sound. ⓛ sound power (Lw), ② sound intensity (Li), ③ sound pressure (Lp) ① Sound Power (Lw) - 음향파워레벨 - The sound power of a source is expressed in terms of its sound power level and is written as (Lw or PWL) - Sound power reference level (기준 음향파워 W0) = 10^-12W ② Sound Pressur..
