1 Pixel density: Pixel density-The pixel density of a display represents the number of pixels over an area of one inch. 2  Itâs measured in âpixels per inchâ, or ppi.
Eustachian Tube Dysfunction can be caused by large adenoids, allergies, or a cold. This dysfunction can cause crackling or popping noises in our ears. The tube is lined with moist mucosa, and inflamed Eustachian tubes often get sticky, which causes the crackling and popping noises when the tubes are moving around. If the inflammation is serious, it can be easily treated with steroid nasal sprays.
A answered. Ear popping is caused by the Eustachian tube, which normally equalizes pressure between the inner ear and the throat. When the Eustachian tube is dysfunctional due to a cold, allergies or change in altitude such as during a plane ride, the ear can pop as pressure is released and air is forced out.