"Air Pollution and Protection" PPT courseware

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"Air Pollution and Protection" PPT courseware

Part One: Air and Us

1. Could you please talk about its importance to us from the perspective of "air composition"?

oxygen for breathing

Carbon dioxide makes soda and fire extinguishing

Nitrogen

Noble gases

water vapor

It can be seen that air is a very precious resource for us!

2. Read the textbook to understand the characteristics of "respirable particulate matter" and the harm to human health?

Solid particles that are not easy to settle and float in the air for a long time

Inhaling it can cause:

chronic tracheitis,

pneumoconiosis,

Silicosis,

lung cancer

3. Do you know where these inhalable particles come from?

Smoke from factories, soot from cars, and dust from construction sites

4. Another cause of air pollution is the introduction of toxic and harmful components that are not in the air under normal circumstances.

The most typical ones are gases from car exhaust emissions:

carbon monoxide

Nitrogen oxides (nitric oxide and nitrogen dioxide)

sulfur dioxide

Air Pollution and Protection PPT, Part 2: Death in the Sky: Acid Rain

Acid rain is natural precipitation (including rain, snow, frost, hail, dew, etc.) that absorbs and dissolves sulfur dioxide, nitrogen oxides and other substances in the air during its formation and fall, forming acidic precipitation with a pH less than 5.6.

The main harmful substances in acid rain are sulfuric acid and nitric acid, which are highly corrosive!

Read the textbook and summarize the dangers of acid rain?

1. Affect human health

2. Acidify waters and soil, damaging crops and forest growth

3. Pollution of surface water and water sources, making it impossible for aquatic life to survive

4. Corrosion of buildings, cultural monuments and metal equipment

Air pollution and protection PPT, Part 3: Protecting the air

What can we do to make the air better?

①Control pollution sources

(Car exhaust and industrial waste gas are treated before being discharged)

② Strengthen air quality monitoring and forecasting

air pollution index

The concentrations of several routinely monitored air pollutants are simplified into numerical forms, and the levels of air pollution and air quality conditions are expressed in grades.

Air quality status primary pollutants

Sulfur dioxide, carbon monoxide, nitrogen dioxide, respirable particulate matter, ozone

③Develop “green industry” and use clean energy

④Afforestation

Air Pollution and Protection PPT, Part 4: Family Experiment

1. Paste a layer of double-sided transparent self-adhesive tape on a glass slide and place it in various environments to collect suspended particles in the air.

2. Place a piece of black paper under the slide and observe with the naked eye the changes in the adhesive tape as the placement time increases. What does this mean?

There are respirable particles in the air

3. After leaving it for 24 hours, take back the slide and observe the adhesive tape with a magnifying glass. Then, cover the slide with a cover slip on the self-adhesive tape and place it under a microscope for further observation.

There are ___________ on the self-adhesive tape; where did they come from? ____________________Are the particles stuck to the same in different environments?

The particles attached to different environments are different

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, air pollution and protection PPT download, .PPT format;

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Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

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