7dB

7dB refers to a sound pressure level of 7 decibels. The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, most commonly sound power or sound intensity. In the context of sound pressure level, 7 dB represents a very quiet sound. For comparison, normal conversation is typically around 60 dB, and the threshold of hearing is generally considered to be 0 dB.

The human ear's perception of loudness is logarithmic, meaning that a doubling of sound intensity is perceived as approximately a 3 dB increase, and a tenfold increase in sound intensity is perceived as approximately a 10 dB increase. Therefore, 7 dB is significantly below everyday ambient noise levels. Examples of sounds at or near 7 dB might include the quiet rustling of leaves or the gentle ticking of a very quiet clock in an otherwise silent environment. It is important to note that the specific perceived loudness can also be influenced by the frequency of the sound. At such low levels, the sound is barely perceptible to most individuals and is often considered to be at the edge of audibility.