It's the same thing as a hollow bone. That's one of the characteristics birds posse than enables them to fly (if their bones had the same weight as ours, they wouldn't be able to lift). Some dinosaurs had the same type of bones.
Hope it helped.
It is extremely essential in Hydraulics and mechanics. Your car would not run without pneumatics.
Poorly pneumatised refers to a condition where there is inadequate development or air-filled spaces within a structure, typically seen in the sinuses or mastoid bone. This can lead to symptoms such as chronic sinusitis, pressure changes, and increased risk of infections due to poor drainage. Treatment may involve medical management or surgical intervention to improve pneumatization and alleviate symptoms.