Clouds are visible mass of water droplets or ice crystals suspended in the atmosphere. Clouds are formed when evaporation takes place, causing water to evaporate and rise up. As the air rises up, it starts to cool. When the water vapour rise up to the air at the dew point temperature, the water vapour will condense on tiny particles, known as condensation nuclei. The condensed water droplets will bump into each other and become larger in a process known as coalescence, which forms clouds.
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