It sounds sexy, but this is water vapour. Water in the air that was present during the day and evaporated by the sun gets a chance to regroup/hug at night. We have discussed it in the last three paragraphs, but there is more information (only because you asked). That is because these surfaces are not warmed by the heat from the ground. You might have observed that dew is mostly settled on grass, car roofs and railings. When temperatures are very low, dew turns into ice. When the moisture in the air condenses at a rate greater than it can evaporate, you see water droplets being formed, which we call dew. Humidity in the air indicates how much water vapour the air is saturated with.ĭue to the absence of heat from the sun, water vapour stays closer to the ground at night. The relative humidity in the air depends on the amount of water in the air and air temperature. At night, the sun goes down beneath the horizon and the water that is in the air stays as it is. The sun makes the molecules of water escape and form water vapour, which rises up and forms clouds. I know most of us do not remember any lessons from school, so let us go through it once again. You read how clouds are formed in school. The heat from the sun turns the water present in the air into vapour. During the day, the sun is shining brightly, giving enough heat to cause water in the air to evaporate. You go out and feel you have been under a shower. You feel your glasses fog up during the night.
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