On the coldest night in Vostok Station, Antarctica, the temperature dropped from 0°C to - 24°C in 4 hours.

What is the average temperature change per hour?

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[___] ºC?

Average of any physical quantity is defined over an interval of time. Therefore, the average temperature for this case should be calculated as follows:

Average temperature = (final temp. - initial temp.) / total time

Average temperature = (-24 - 0) / 4

Average temperature = - 6°C

Hope this answers the question. Have a nice day.