With increasing altitude, up to about 40,000 ft, the characteristics of air change: 1- Temperature decreases continuously with altitude 2- Pressure falls steadily to an altitude of about 36,000 ft, where it then remains constant 3- Density decreases steadily with increasing altitude 4- Pressure falls steadily with increasing altitude The combination of true statements is:

1) Density is at poles than equator

2) With increasing altitude, up to about 40,000 ft, the characteristics of air change: 1- Temperature decreases continuously with altitude 2- Pressure falls steadily to an altitude of about 36,000 ft, where it then remains constant 3- Density decreases steadily with increasing altitude 4- Pressure falls steadily with increasing altitude The combination of true statements is:

3) Consider the following statements relative to Air Density and select the one which is correct

4) Density Altitude is

5) At sea level the ISA density is stated to be :