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A short class with Sarah and her students. The other ways are under More.
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Today, we will discuss fog and mist. Can anyone explain what fog is?
Is it that low cloud that makes it hard to see?
Exactly! Fog is a low cloud formed when a large amount of water vapor condenses around dust particles. What about mist?
Mist is like fog but it’s less dense, right?
Correct! Mist contains more moisture than fog but is not as thick. Both reduce visibility. Let's remember: 'More moisture, less visibility' – MMLV!
So, when does fog become smog?
Good question! When fog combines with smoke and pollution, it’s termed smog. Now let’s summarize: Fog is denser, less moisture than mist, and smog occurs with smoke.
What are the ideal conditions for fog formation?
Calm air and a lot of humidity?
Exactly! Calm air and high humidity are crucial. Fog forms especially during cold nights under clear skies. Can anyone think of a location where you might see this?
Maybe over mountains where warm air travels up!
Exactly! As warm air rises and meets cooler conditions, mist and fog can form. Keep this in mind: 'Warm goes up, cold brings down' - WGUBCD!
Shouldn't fog also have a lot of dust particles around?
Yes! Dust and smoke act as condensation nuclei, which help form both fog and mist. Summarizing, fog forms with calm, humid conditions while mist often occurs in mountainous areas.
Let's compare fog and mist. What are their visibility implications?
Fog makes visibility really low, almost zero!
Right! Fog is denser than mist. Can someone elaborate on what happens when they mix with smoke?
That’s smog! It's even worse for visibility.
Exactly! Smog is a harmful mix of fog and smoke. Remember: 'Fog + Smoke = Smog' - F+S=S. Now let's recap the main differences: fog is heavier, mist is more moisture-rich.
A dense cloud at ground level, forming under specific conditions that greatly reduce visibility.
A lighter version of fog, less dense but still capable of reducing visibility.
The fundamental process by which water vapor turns to liquid in the atmosphere.
Refers to how far one can see, impacted negatively by fog and mist.
Fog is thick, mist is light; can't see much, day turns night.
Once upon a time, in a valley, fog rolled in thick like a cozy blanket, while mist danced around the trees, weaving in and out like smoke from a chimney.
Famous for reducing sight, fog brings the night; Mist's still around, but visibility's not drowned. F=Fog, M=Mist.
Fogs Are Dense (FAD) - referring to how fog is a denser cloud compared to mist.
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What is fog?
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Difference between fog and mist?
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What contributes to fog formation?
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What happens when fog mixes with smoke?
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A cloud at or near the ground resulting from the condensation of water vapor in moist air.
A thin layer of water droplets suspended in the air that reduces visibility, but is less dense than fog.
The process by which water vapor cools and forms liquid water.
The distance one can clearly see, significantly reduced in fog and mist.
Small particles (like dust or smoke) around which condensation occurs.
Fog and mist are forms of condensation that create low-lying clouds, reducing visibility due to moisture in the air.
Fog and mist form when the temperature of moist air suddenly drops, causing condensation on dust particles. While both contain moisture, mist has more than fog, impacting visibility in weather conditions.
Fog and mist represent two forms of low-lying clouds resulting from condensation of water vapor in the atmosphere when temperatures sharply decrease. When an air mass that holds a considerable amount of water vapor experiences a sudden drop in temperature, condensation activates on fine dust particles within the air, leading to the formation of fog.
Key Characteristics of Fog:
Key Characteristics of Mist: