"The Formation of Clouds and Fog" Water Cycle in Nature PPT Courseware

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"The Formation of Clouds and Fog" Water Cycle in Nature PPT Courseware

1. What is fog? What are the classifications of fog?

The weather phenomenon in which the air near the ground is cooled and humidified, or the mixing of cold and warm air causes water vapor to condense and form a large number of water droplets or ice crystals suspended in the atmosphere near the ground, reducing the visibility of the atmosphere to less than 1 km, is called fog, and the visibility ranges from 1 to 10 kilometers. is called light mist.

Fog is divided into four categories:

1. Radiation fog;

2. Frontal fog;

3. Advection fog;

4. Ice fog.

2. How is fog formed?

The formation of fog requires three conditions:

One is cooling;

The second is humidification;

Third, there are condensation nuclei, which increase the water vapor content.

If the ground loses heat, the temperature drops, and the air is quite humid, then when it cools to a certain level, part of the water vapor in the air will condense out and turn into many small water droplets, suspended in the air layer near the ground, forming Fog.

3. What impact does fog have on our lives?

Fog is one of the weather conditions that has the greatest impact on human transportation activities. Due to the greatly reduced visibility during fog, many means of transportation cannot be used or their efficiency is reduced. For example, when heavy fog occurs with visibility less than 50 meters, airports suspend aircraft takeoffs and landings, highways are temporarily closed, and ferries are temporarily suspended.

In addition, fog is actually formed by small water droplets in the air attaching to dust in the air, so more fog means more dust in the air, which is harmful to people's health. Therefore, people should reduce the time for outdoor activities in foggy weather, wear scarves and masks when outdoors, and protect their skin, throat, joints and other parts. Middle-aged and elderly people, children, and people with weak health should pay more attention to protection.

4. What is cloud?

Clouds are collections of water droplets or ice crystal colloids that remain in the atmosphere. Clouds are the tangible result of Earth's vast water cycle. The sun shines on the surface of the earth, and water evaporates to form water vapor. Once the water vapor is supersaturated, water molecules will gather around dust particles (condensation nuclei) in the air. The resulting water droplets or ice crystals will scatter sunlight in all directions. This creates the appearance of a cloud.

5. How are clouds formed?

The water in rivers, rivers, lakes, seas, land surfaces, and in animals and plants on the earth is exposed to sunlight and constantly evaporates, turning into water vapor and mixing into the atmosphere. It becomes high in the sky with the rise of warm air currents. Due to the high altitude The temperature is getting lower and lower, and water vapor will turn into small water droplets when it is cold. If the temperature at high altitude is below 0°C, water vapor will turn into small ice crystals. Countless small water droplets or small ice crystals gather together to form clouds.

6. What are the similarities and differences between clouds and fog?

Similarity: water vapor in the air is cooled and turns into small water droplets or small ice crystals

difference:

Fog: Forms at low altitude and touches the ground

Clouds: formed high in the sky and do not touch the ground

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Update Time: 2024-09-07

This template belongs to science courseware People's Education Press Sixth Grade Science Volume 1 industry PPT template

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