Do you know which the quietiest place on Earth is?
It is Microsoft office in Redmond headquarters in USA. To be precise Anechoic chamber is the exact place at -20.6 dB.
There are six concrete rooms within rooms that enclose the chamber and can reduce the noise of a jet taking off to a whisper.
Literal meaning of Anechoic is echo free.
Year 2015 saw the world record of -9.4dB in Orfield Laboratories in Minneapolis.
Let’s walk through sounds heard at different decibels (dB) which is a measurement unit of sound.
10 dB is the sound of normal breathing.
0 dB is the lowest limit of sound that a human ear can hear.
Negative dB is the sound that a human ear cannot hear.
-24 dB is the noise produced by colliding air molecules and this quietness is outside vacuum.
-20.6 dB is the sound limit inside the Anechoic chamber. The room is so quiet that you can hear your blood flow.