Key Information
Fog and Mist
| Type | Aerosol and Visible Water Droplets |
| Season | All Year Round |
| Effect | Obscures visibility and also transports Water, used by some living things as a source of water |
| Forms | Mist, Fog, Freezing Fog, Frozen Fog |
Learning Point
- Fog and mist are essentially clouds on the ground, formed when water vapor condenses into tiny droplets near the Earth’s surface. The difference is all about visibility: it’s called mist if you can see beyond one kilometer, and fog if it’s thick enough to obscure your view. This occurs when moist air hits a cold surface or temperatures drop to the “dew point” at night. Beyond creating a moody atmosphere for movies, fog is a vital water source for ecosystems like the California Redwoods, where trees “drink” moisture directly from the air.
Project
- Draw a picture of your favourite time with fog and mist.
- Overview
- Up Close
Fog
Mist
Location
| Location | Worldwide |
Fun Facts
- Fog and mist are made of billions of tiny water droplets. They are so light that they “float” in the air. If those droplets got any bigger or heavier, they would turn into rain and fall to the ground!
- Because sound waves bounce off the tiny water droplets in the air, sounds can change in the fog. Sometimes things sound muffled and quiet, but other times, sounds can travel much further than usual—which is why fog can feel so creepy!
- Have you ever heard of a Fogbow? It’s like a rainbow, but because the water droplets in fog are so tiny, the colors don’t show up clearly. Instead, it looks like a spooky, glowing white arch in the sky.
- In some very dry places like deserts, animals and plants “drink” the fog! Beetles and trees catch the tiny fog droplets on their bodies or leaves and let the water drip down into their mouths or roots.
Past Lessons
| 183 | January 19, 2026 | (North America) |