Hearing
The absolute threshold of hearing is the minimum sound level of a pure tone that an average ear with normal hearing can hear with no other sound present. The absolute threshold relates to the sound that can just be heard by the organism.
The threshold of hearing is generally reported as the RMS sound pressure of 20 µPa (micropascals) = 2×10−5 pascal (Pa). It is approximately the quietest sound a young human with undamaged hearing can detect at 1,000 Hz. The threshold of hearing is frequency dependent and it has been shown that the ear's sensitivity is best at frequencies between 1 kHz and 5 kHz.
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Famous quotes containing the word hearing:
“It was my thirtieth year to heaven
Woke to my hearing from harbor and neighbor wood”
—Dylan Thomas (1914–1953)
“I sprang not more in joy at first hearing he was a man-child
than now in first seeing he had proved himself a man.”
—William Shakespeare (1564–1616)
“I am glad I made the late race. It gave me a hearing on the great and durable question of the age, which I could have had in no other way; and though I now sink out of view, and shall be forgotten, I believe I have made some marks which will tell for the cause of civil liberty long after I am gone.”
—Abraham Lincoln (1809–1865)