Why are fog and mist classified as suspensions rather than precipitation?
Fog and mist are classified as suspensions because they are tiny liquid water droplets held up within the air near the ground, not water that is falling out of the atmosphere. In precipitation (rain, snow, hail), particles grow large enough that gravity makes them fall to the surface. In fog and mist, the droplets are so small and light that they remain suspended and mainly reduce visibility instead of reaching the ground as a fall.
What the classification is really about
The difference between a “suspension” and “precipitation” comes down to whether the water particles are staying in the air or falling to the ground under gravity.
What fog and mist are made of
Fog and mist consist of very small liquid droplets (or sometimes tiny ice crystals) dispersed through air close to Earth’s surface. The droplets are microscopic, so air resistance and turbulence can keep them floating.
What makes something precipitation
Precipitation happens when cloud particles become large enough that their weight overcomes the upward motions of air and drag forces, so they fall. That is why rain, snow, sleet, and hail are considered precipitation: they are actively reaching the ground.
Quick check you can use
- If it is “in the air” and mainly lowers visibility: suspension (fog/mist).
- If it is “falling” and accumulating on the surface: precipitation (rain/snow/etc.).
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