"Catch the Dust" PPT courseware

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"Catch the Dust" PPT courseware

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In the last lesson, we learned about the importance of fresh air to humans. And knowing some of the causes of air pollution, can you name a few?

air pollution indicators

The amount of suspended matter in the air is an important criterion for measuring the quality of air in an area. Suspended matter is what we often call dust.

Experiment: Where is the dust most?

Use cardboard, double-sided tape, and colored pens to complete the experiments in the textbook.

All markers should be placed in appropriate locations, recovered in a timely manner, and conclusions drawn after careful observation.

Experimental results

Where is the dust most in the classroom (front) and classroom (back)? Why?

Playground, dormitory, toilet, classroom, canteen, corridor, which place has the most dust? Where is the least? Why?

Where does the dust come from?

So where does this dust in the air come from?

What impact does dust have on humans? Are there only disadvantages?

Dust is good for humans

If there were no dust in the air, the sunlight would not be absorbed, reflected and refracted, and the sky would be a vast expanse of white, without wind, snow, rain, dew, rays, or rainbows.

Without the core of dust, water vapor in the air cannot condense, and clouds in the sky cannot form. The weather is either too hot or too cold. Without dust, many harmful rays in the universe would penetrate the earth's surface without any hindrance and pose a fatal threat to humans and various living creatures.

Dust for humans (disadvantages)

Dust is the enemy of human health, because it carries many bacteria, viruses and insect eggs flying everywhere, spreading diseases. Industrial dust can cause workers to suffer from various occupational diseases that are difficult to cure. Excessive dust can also cause environmental pollution, affect people's normal life and work, induce human respiratory diseases, etc.

Dust is very harmful to computers. Excessive dust may block the CPU fan, causing the fan to stop spinning, causing the CPU to overheat and burn.

How to reduce the harm of dust to humans?

Install dust removal devices in factories and other places.

Strengthen management and strictly implement environmental protection requirements.

Plant dust-attracting plants along roads.

People working in dusty locations should wear protective equipment.

Use some plants to remove dust around your home.

Summary: In order to truly solve the crisis that dust brings to mankind, we must first control the source of dust generation and then implement dust collection measures.

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Update Time: 2024-11-23

This template belongs to science courseware E-education edition fifth grade science volume 2 industry PPT template

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