At 3,000 feet PA with -9°C, density altitude is lower than the true altitude?

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Test your knowledge of pitot-static systems for aviation exams. Study with multiple-choice questions and detailed explanations. Prepare effectively for success on your exam!

Multiple Choice

At 3,000 feet PA with -9°C, density altitude is lower than the true altitude?

Explanation:
Density altitude indicates how dense the air is compared with the standard atmosphere at a given altitude. Colder air is denser than standard at the same altitude, so the density you have at that altitude corresponds to a lower point in the standard atmosphere. At 3,000 feet pressure altitude, the standard temperature is 9°C. The actual temperature is -9°C, which is 18°C colder than standard. That much colder air is much denser, so the density at 3,000 feet pressure altitude matches the density you’d find at a lower altitude in the standard atmosphere. Therefore density altitude is lower than the true (actual) altitude.

Density altitude indicates how dense the air is compared with the standard atmosphere at a given altitude. Colder air is denser than standard at the same altitude, so the density you have at that altitude corresponds to a lower point in the standard atmosphere.

At 3,000 feet pressure altitude, the standard temperature is 9°C. The actual temperature is -9°C, which is 18°C colder than standard. That much colder air is much denser, so the density at 3,000 feet pressure altitude matches the density you’d find at a lower altitude in the standard atmosphere. Therefore density altitude is lower than the true (actual) altitude.

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