Environmentalhard · Past Paper
What is the 'Residence Time' of a gas in the atmosphere?
AThe time it takes for a gas to reach the moon
BThe average time a molecule of gas spends in the atmosphere before being removed
CThe time humans spend indoors
DThe duration of a lightning strike
✓ Correct Answer: B — The average time a molecule of gas spends in the atmosphere before being removed
Residence time is calculated as the amount of gas in the reservoir divided by the rate of removal.
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