STEM与日常科技·英语30篇（5）

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STEM轻科普延展阅读·独立成篇（2026-D012）

Dew forms when moist air cools overnight and reaches its dew point temperature.
Grass loses heat quickly by radiation, so its surface drops below the dew point.
Pavement stays warmer because it stores and slowly releases daytime heat.
This temperature difference explains why dew collects on grass but not on roads.
The process requires calm air, clear skies, and high humidity near the ground.
Dew is pure water, since condensation leaves salts and pollutants behind.
Unlike rain, dew forms directly from vapor without passing through clouds.
Scientists measure dew points to predict fog, frost, and comfort levels outdoors.
In dry climates, dew can be a vital water source for insects and desert plants.
Understanding dew helps engineers design better condensation-based water harvesters.