Source+8

"Sensitivity of the Human Ear." //Human Ear//. N.p., n.d. Web. 20 Aug. 2012. .

Facts:


 * 1) The human ear is capable of detecting pressure variations of less than one billionth of atmospheric pressure.
 * 2) The threshold of hearing corresponds to air vibrations.
 * 3) The outer and middle structure of the ear, amplifies the correspondents to the air vibrations.
 * 4) An audible frequency rang is 20hz to 20khz.
 * 5) How high of a frequency a person can hear has to do with their threshold of pain and hearing.
 * 6) The threshold of hearing corresponds to air vibrations.
 * 7) The human ear detects sounds depending on the pressure around it.
 * 8) Sound can travel differently through different temperature.
 * 9) Sound travels faster throw crisp, cold air.
 * 10) Sound travels slower throw thick, hot air.
 * 11) The structure of the outer and middle ear, give your ear the ability to hear.
 * 12) The human ear would not be able to hear without the ridges and the form of the outer and middle ear.
 * 13) "Sound" refers to frequencies the human ear can hear or otherwise unaudiable.
 * 14) A normal human ear can easily detect the difference between KHZ.
 * 15) Even if those KHZ are only a couple notches different.