The Delhi-NCR region is currently shrouded in haze. Smog is a mixture of fog and smoke generated mainly by pollution. In a few days, as the temperature continues to drop, fog, instead of smog, will dominate the urban landscape.
Seeing fog throughout the winter is very typical. Have you ever thought about how and why it is formed? This question was posted on the Quora internet community.
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- What causes fog during winter?
- Why can we see fog?
- How is fog different from fog?
What causes fog during winter?
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To begin with, fog is quite common in winter, especially in northern India. Colder temperatures increase the likelihood of fog forming.
Fog reduces vision to less than a kilometer. During the colder months, water evaporates and becomes invisible as water vapor from morning dew, lakes and rivers.
They accumulate dust, smoke and soot particles, which makes water droplets visible and causes fog. The air cools rapidly at night, forcing the vapor to condense back into water droplets.
Why can we see fog?
The concept was presented in a Quora answer written by a paragliding pilot who is also a meteorology professor. He defined fog as “clouds that form at zero altitude above ground level.” This is more likely to occur during high pressure systems in winter because the wind speed is so low that the fog cannot dissipate on its own.
Another user responded that on a clear winter night, the ground cools significantly, which cools the air in direct contact with it, causing it to reach the dew point, the temperature at which water vapor in the air is released. condenses into small droplets.
Above the surface cloud layer (fog), the air is slightly warmer. This is known as investing.
Another user gave a simple explanation, stating that as winter nights get longer, we often see clear, cloudless skies at night. As the air cools at night, the relative humidity increases, which can cause fog to form.
How is fog different from fog?
Fog is not the same as mist. While both appear similar, fog contains tiny water droplets on suspended air particles, causing vision problems. Fog is finer and lighter than fog, which is much thicker and denser. Fog also has a limited lifespan.
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Source: vtt.edu.vn