The process then continues.Įventually, the ice crystals ( snow) will fall. Since the amount of water vapor in the air has decreased, and from the perspective of the supercooled water droplet, the air is subsaturated, the supercooled water will evaporate until the air once again reaches saturation. Therefore, water vapor will sublimate on the ice crystals. From the perspective of the supercooled droplets, the air is in equilibrium at saturation, but from the perspective of the ice crystals, the air is supersaturated. We will now have a combination of ice crystals and supercooled water droplets. The air reaches saturation and some of the resulting droplets will come in contact with freezing nuclei (assuming they have reached the activation temperature ). I like t he discussion on the College of Dupage Nexlab website: Clouds are often a mixture of ice crystals and super-cooled water drops, and some interesting things happen because of that fact. In many places, the Bergeron or "cold rain" process is responsible for the formation of rain (even on a hot summer day). These aromatic compounds combine to create the pleasant petrichor scent when rain hits the ground.Įven though it is raining where you are, it probably started as snow. The second reaction that creates petrichor occurs when chemicals produced by soil-dwelling bacteria known as actinomycetes are released. Some plants secrete oils during dry periods, and when it rains, these oils are released into the air.
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