Science · 6 pages · 12 min
How dew forms on grass overnight
Grass cools by radiating heat, and vapor in the nearby air condenses on the cold blades.
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From the opening
Overnight dew is water that condensed on the grass, not rain that fell in drops too small to notice. The blades lose heat to the sky, drop below the dew point of the air around them, and vapor in that air turns to liquid on the surface. The opening covers why the grass cools faster than air, what the dew point is marking, and why wind and cloud suppress it.
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Inside
- Why the grass cools faster than air
- What the dew point is marking
- Why wind and cloud suppress it
- When the deposit is frost instead
- Where the idea stops applying
- A distinction worth keeping
Sources
- Radiative cooling of the ground on a clear night
- Condensation when a surface crosses the dew point