Using ISA data, how many degrees Celsius cooler is the air at 4000 feet compared with sea level?

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Multiple Choice

Using ISA data, how many degrees Celsius cooler is the air at 4000 feet compared with sea level?

Explanation:
Under the International Standard Atmosphere, temperature decreases with height at about 1.98°C per 1,000 feet. Going up 4,000 feet gives 4 × 1.98 ≈ 7.92°C of cooling. So the air at 4,000 feet is about 7.92°C cooler than at sea level—roughly 8°C cooler. This is why the correct choice is 8 degrees Celsius.

Under the International Standard Atmosphere, temperature decreases with height at about 1.98°C per 1,000 feet. Going up 4,000 feet gives 4 × 1.98 ≈ 7.92°C of cooling. So the air at 4,000 feet is about 7.92°C cooler than at sea level—roughly 8°C cooler. This is why the correct choice is 8 degrees Celsius.

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