Step 1: Understand atmospheric stability conditions. The stability of the atmosphere is determined by the temperature gradient with height: Normal condition: Temperature decreases with height (lapse rate).
Inversion: Temperature increases with height, which is an abnormal condition and leads to a stable atmosphere.
Neutral condition: The temperature remains constant with height.
Unstable condition: When the environmental lapse rate exceeds the adiabatic lapse rate, the atmosphere becomes unstable.
Step 2: Analyze the given scenario. In the question, the environmental temperature increases by 6 with height, indicating a temperature inversion.
Step 3: Select the correct stability condition. A temperature increase with height represents an inversion, leading to stable atmospheric conditions where vertical air movement is suppressed.
Length of the streets, in km, are shown on the network. The minimum distance travelled by the sweeping machine for completing the job of sweeping all the streets is ________ km. (rounded off to nearest integer)