Pressurization becomes increasingly necessary at altitudes above 12,500 to 14,000 feet (3,800 to 4,300 m) above sea level to protect crew and passengers from the risk of a number of physiological problems caused by the low outside air pressure above that altitude.
1. (Architecture) the art and science of designing and superintending the erection of buildings and similar structures. 2. (Architecture) a style of building or structure: Gothic architecture. 3. (Architecture) buildings or structures collectively. 4. the structure or design of anything: the architecture of the universe.
Architectural style. An architectural style is a specific method of construction, characterized by the features that make it notable. A style may include such elements as form, method of construction, materials, and regional character. Most architecture can be classified as a chronology of styles which changes over time.