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Equal-loudness contour. An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. [ 1] The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours.
A pressure–volume diagram (or PV diagram, or volume–pressure loop) [ 1] is used to describe corresponding changes in volume and pressure in a system. They are commonly used in thermodynamics, cardiovascular physiology, and respiratory physiology . PV diagrams, originally called indicator diagrams, were developed in the 18th century as tools ...
Website. rayj .com. William Ray Norwood Jr. (born January 17, 1981), [ 1 ] known professionally as Ray J, is an American R&B singer, songwriter, television presenter, and actor. Born in McComb, Mississippi and raised in Carson, California, he is the younger brother of singer and actress Brandy. [ 3 ]
The Three-Year Swim Club by Julie Checkoway. This nonfiction read interweaves Olympic, Japanese-Hawaiian and WWII history in an inspiring story of overcoming adversity. The sugar ditch kids are ...
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Nearly 10 hours of hearings. And yet neither Boeing nor the National Transportation Safety Board know how a 737 Max was delivered to Alaska Airlines without the four bolts needed to keep a door ...
Jenna Bush Hager had an emotional weekend dropping both her daughters off at summer camp. “Little tears under my big sunglasses,” Jenna told her TODAY co-host Hoda Kotb on July 8. Jenna shares ...
The Eustachian tube ( / juːˈsteɪʃən / ), also called the auditory tube or pharyngotympanic tube, [ 1] is a tube that links the nasopharynx to the middle ear, of which it is also a part. In adult humans, the Eustachian tube is approximately 35 mm (1.4 in) long and 3 mm (0.12 in) in diameter. [ 2] It is named after the sixteenth-century ...