STEM与日常科技·英语30篇（6）
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Why Morning Dew Appears Only on Certain Surfaces During Clear Nights
为何晴朗夜晚只有特定表面会出现晨露
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Dew forms when surfaces cool below the dew point temperature, causing atmospheric water vapor to condense directly.
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Materials like grass and metal lose heat rapidly through radiation, dropping faster than soil or wood on clear nights.
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High humidity and low wind are essential because still air prevents mixing that would warm the surface.
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Scientists use infrared thermography to map micro-scale temperature differences across urban and rural landscapes.
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Dark, thin objects radiate heat more efficiently, explaining why car roofs often glisten while nearby concrete stays dry.
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Plants emit less longwave radiation than artificial surfaces, which partly explains why lawns collect more dew than sidewalks.
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Dew-point calculators combine air temperature, relative humidity, and surface emissivity to forecast formation likelihood.
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In agriculture, dew monitoring helps time pesticide applications to avoid runoff from premature evaporation.
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Urban heat islands suppress dew formation, altering local microclimates and plant transpiration patterns.
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This natural condensation process demonstrates thermodynamics principles accessible through backyard observation.