During our childhood days, most of us loved the sight of an airplane wheezing past over our head, high up in the clear, blue sky. At times, the plane left a white trail behind. Many kids credited it to rocket, destined to the outer world. It wasn't until class 4, when the mystery of the 'white linear clouds' was resolved by my dad. But do you know the reason for the formation of trail? Let us understand the science behind it. What are the white trails formed by a jet? When an air plane flies high in earth's atmosphere, we at times see it leaving a trail, that tells the 'road' travelled. The reason behind this phenomenon is ' Condensation '. The exhaust from the plane, pumps water vapour in the air, which on mixing with the outside cold air, condense quickly to form a 'white cloud', as viewed from the ground. These are, in science terminology, called ' Contrails ', short for Condensation trails. Why some trails are
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