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Fog is a meteorological phenomenon that appears as a cloud near the Earth's surface. It consists of microscopic liquid water droplets suspended in air, which is why it is classified as a liquid-in-gas dispersion. Unlike clouds that form at higher altitudes, fog occurs close to the ground and can reduce visibility significantly.
Fog forms when humid air cools to the dew point, causing water vapor to condense into tiny droplets.
Common conditions include early morning or evening, particularly after rain or in areas near lakes and rivers.
The suspended water droplets are small enough to remain in the air, creating the misty appearance.
Appearance: White or grayish layer near the ground.
Particle Size: Droplets range from 1–10 micrometers, small enough to remain suspended.
Colloidal Nature: Fog is considered a colloid because the liquid droplets are dispersed in a continuous gas phase without settling quickly.
| Mixture Type | Example | Notes |
|---|---|---|
| Gas in gas | Air | Not fog |
| Gas in liquid | Soda (COâ‚‚ in water) | Not fog |
| Liquid in gas | Fog, mist, clouds | Correct |
| Liquid in liquid | Milk, emulsions | Not fog |
Fog affects transportation, weather forecasting, and climate studies.
Studying fog helps understand humidity, condensation, and atmospheric conditions.
Fog = liquid droplets in gas (air)
Forms when humid air reaches dew point
Classified as a colloidal dispersion
Reduces visibility and plays a role in weather and climate studies
👉 Correct Answer: Option 3 – Liquid in Gas
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