but then that'd be followed by (1-10) -9 atmospheres of pressure? Pressure can't go negative, so it goes down as far as it can to 0 (a total vacuum) then rebounds up to 2 atmospheres, effectively becoming a 191dB sound. If, say, you tried to play a 201dB sound (ten times more pressure than the atmosphere) you'd get an incredible peak of pressure effectively (1+10) 11 atmospheres of pressure. 20dB is then a hundred times louder, 2000μPa, or 2mPa, while 40dB is 200mPa (200,000μPa).Īt around 191dB, you reach the same pressure as standard atmosphere, which means you can't sustain a sound louder than that in our atmosphere. This is roughly the lower limit of human hearing. In the case of sound, 0dB-SPL (Sound Pressure Level) is usually a variation from ambient air pressure by 20μPa (micropascals). 0dB is simply the reference point of what you're measuring (decibels can actually be used to measure lots of things, particularly electronic signals). While it is true that 0 times anything is 0, 0dB isn't 0 sound. Further extrapolation tells us that it's a thousand times louder than 10dB, and ten thousand times louder than. The astute might notice an oddity here: because it's logarithmic, 40dB is ten times louder than 30dB, and a hundred times louder than 20dB. Please also read the site-wide Reddiquette. Please avoid reposting TILs that have already made the front page in the past on YouTube)Īdd or tags to your posts, as necessary. Link to the appropriate start time when referencing videos (e.g. Link to the appropriate heading when referencing an article (particularly on Wikipedia) If you are interested in reading about the TILs on this list use the search box feature and enter the keywords to pull up past TILs.Īvoid mobile versions of websites (e.g. The purpose is to keep content fresh on /r/todayilearned as requested by its members. The titles have been abridged for the sake of brevity, however the context remains the same. If your TIL is found on this list, it will be removed.
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