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Explanation:
a) The ratio of actual mass of vapour content in the air for a given volume and temperature to that required to make the air saturated with vapour at that temperature is called relative humidity. The white trail behind the plane is basically the vapour released by the airplane engine condensing in sky to form cloud.
b) If the relative humidity of the air surrounding the plane is low either the white trail may be small or there will be a no formation of white trail.
c) When the air is dry and humid it will take longer time for the trial to disappear.
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