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"The Air Around Us" Water and Air PPT Courseware
Experience activity one:
First put your hands in front of your nose, face your nostrils with your palms, and feel your breathing. Then use the other methods you just thought of to feel your breathing.
Experience activity two:
Please hold your nose with your hands and see how long you can hold on? If you can't hold on, don't hold on.
Experience activity three:
Put your hands on your chest, take a deep breath, and then slowly exhale. Repeat this several times and feel the changes in your chest and abdomen when you inhale and exhale.
The human respiratory organs consist of the nose, throat, trachea, bronchi and lungs. The lungs are the place where gases are exchanged and the other organs are the passages for gases - the respiratory tract. The lungs are divided into left lung and right lung. There are many alveoli in the lungs, with a total of 750 million. If the alveoli are expanded, the surface area can reach 55 square meters to 70 square meters. The surface of the alveoli is densely covered with a network of capillaries.
protect air
1Main pollutants: sulfur dioxide, carbon oxides, nitrogen oxides, hydrocarbons, flying dust, coal dust, radioactive substances, etc.
2Three major environmental issues
(1) Acid rain: sulfur dioxide (SO2)
(2) Greenhouse effect: carbon dioxide (CO2)
(3) Ozone hole: chlorofluorocarbons
Governance:
1. Reduce the use of fossil fuels such as coal, oil, and natural gas (or perform deS treatment during combustion)
2. Improve the fuel structure and install purification devices to reduce harmful gas emissions.
3. Reduce industrial waste gas emissions, recycle, purify and reuse waste gas.
4. Vigorously plant trees and strictly prohibit indiscriminate logging
5. Develop new energy sources (solar energy, hydrogen energy, wind energy, geothermal energy, etc.)
6. Government departments should make reasonable plans, set standards, and strengthen monitoring.
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