The temperature decreases steadily with increasing altitude from sea level to 36,000 feet, after which the temperature remains constant at about -69.7°F up to an elevation of 65, 600 ft.
The probable temperature at the airplane height of 20,000 feet is about -32°F
The above value is correct due to the following reasons:
The parameters given in the diagram are;
The location of the airplane = 50°N Latitude
The elevation of the airplane above sea level = 20,000ft. above sea level
The variation of temperature with elevation in the lower troposphere is presented as follows
The variation of temperature with height = The standard average lapse rate = 6.5°C per kilometer 3.5°F (2 °C) per 1,000 ft. up to or 36,000 ft.
Therefore, in the given diagram, given that the surface level temperature, t₀ = 0°C, we have the temperature, t at the 20,000 ft. height given as follows;
t = 32°F - 20,000 ft. × 3.5 °F/1,000 ft. = -32°F
The probable temperature at the height of the airplane, 20,000 ft. is approximately -32 °F
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