Atmospheric Composition and Pressure

What is the approximate air pressure at the earth's surface?

What percentage of the atmosphere is composed of gases?

What is the highest altitude that civil aircraft would rarely exceed?

What is the layer of the atmosphere where all of the world's weather is contained?

What is the direction of the change in atmospheric pressure with altitude?

Why do aircraft in English-speaking countries that have adopted the metric system still measure altitude in units of feet?

What is the primary reason for the decrease in air density as altitude increases?

What is the primary purpose of bimetallic strips and discs in various instruments and mechanisms?

What is the term for the height where the temperature stabilizes at about -56 °C?

What is the main reason for the temperature coefficient of an altimeter?

What happens to the elasticity of the capsule material when the temperature decreases at sea level?

Why does air rise as it is heated?

What is the effect of a decrease in temperature on the U-shaped bracket?

What is the purpose of the International Standard Atmosphere (ISA)?

What region of the atmosphere is characterized by rapid temperature decrease with altitude and turbulence?

What is the purpose of the push rods in the altimeter's temperature compensating mechanism?

What is the abbreviation for the International Civil Aviation Organisation?

What would happen to the altimeter reading if the temperature decreases at sea level, without the temperature compensating mechanism?

What is the effect of pressure change on the bimetallic U bracket strip?

What is the primary function of the pitot tube in a pitot static system?

Where are the static ports typically located on an aircraft?

What is the purpose of the electric heaters in a pitot/static tube?

What is the name of the system that supplies pitot and static pressure for the instruments on an aircraft?

What would happen to the bimetallic U bracket strip if there is an increase in ambient temperature?

What happens to the air accelerating over the top of the wing surface as the aircraft approaches the speed of sound?

What is the result of the shock wave formation on the airflow?

What is the Critical Mach Number (Mcrit) of a commercial jet aircraft?

Why is the Maximum Operating Mach Number (Mmo) value determined?

What is the purpose of the lubber mark on a Machmeter?

What is the scale of a Machmeter marked in?