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.
Theyâre listening for abnormal lung sounds such as bibasilar crackles, or rales. These sounds indicate something serious is happening in your lungs. Bibasilar crackles are a bubbling or crackling sound originating from the base of the lungs. They may occur when the lungs inflate or deflate. Theyâre usually brief, and may be described as sounding wet or dry. Excess fluid in the airways causes these sounds.