Under ISA, how many degrees Celsius does the temperature fall per 1,000 feet?

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Multiple Choice

Under ISA, how many degrees Celsius does the temperature fall per 1,000 feet?

Explanation:
In ISA, the temperature decreases with altitude at a constant lapse rate of about 2°C for every 1,000 feet climbed. This means that for each thousand feet of ascent, you subtract roughly 2°C from the standard atmosphere’s temperature. That’s why 2 degrees per 1,000 feet is the correct figure. The other options don’t match this standard rate. Keep in mind this is a reference rate used for calculations; actual conditions can vary.

In ISA, the temperature decreases with altitude at a constant lapse rate of about 2°C for every 1,000 feet climbed. This means that for each thousand feet of ascent, you subtract roughly 2°C from the standard atmosphere’s temperature. That’s why 2 degrees per 1,000 feet is the correct figure. The other options don’t match this standard rate. Keep in mind this is a reference rate used for calculations; actual conditions can vary.

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