An example scale showing power ratios x and amplitude ratios √x and dB equivalents logx.

The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical . BufretOversett denne sidenGå til Standard reference levels – dB scale with some rough examples We said above that the decibel is a ratio. Here are some interesting numbers, collected from a variety of sources, that help one to understand the volume levels of . We often use this logarithmic scale to describe the intensity of sound. The decibel scale is a reflection of the logarithmic response of the human ear to. The sound intensity in decibels above the standard threshold of hearing is . The decibel scale measures sound based on human hearing, which makes it one of the most unusual scientific measurements. A readable explanation of the decibel scale (dB scale), including dBA and dBC. Also phons and sones, noise units for measuring loudness.

Another property of sound or noise is its loudness. A loud noise usually has a larger pressure variation and a weak one has .