Do you know, the World’s Quietest room, is in Washington?

 Do you know, the World’s Quietest room, is in Washington? 

In the headquarters of Microsoft. When you converse with people, the intensity of the sound is 60dB. When you whisper it is 30dB. The sound below 0 dB cant be heard by human ears. Inside the World’s Quietest Room, the sound level is at -20dB. The surfaces of this room are covered by fiberglass wedges. It has a double wall of insulated steel and concrete, that’s one foot thick. This setup ensure that 99.99% of sound are absorbed. Even if an aeroplane takes off besides the building, inside this room you wouldn’t hear that. 

If you’re thinking about how low can a sound get?  The lowest sound level is at -23dB. This sound is made by air molecules when they bounce off of each other. Because of the Brownian motion. 

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