"Changes in the State of Matter in Life and Technology" State of Matter and its Changes PPT Courseware 3

Description

"Changes in the State of Matter in Life and Technology" State of Matter and its Changes PPT Courseware 3

Physical changes in life and technology

1. Water cycle in nature.

The formation process of rain, snow, dew and frost.

2. Working principle of pressure cooker.

3. Working principle of refrigerator.

The formation process of rain

Small water droplets and small ice crystals in the clouds move up and down with the sharp rise and fall of the airflow. When they meet, they gather together and become larger, and when they reach a certain level, they fall. As they fall, the ice crystals absorb heat and melt into water droplets, which fall to the ground together with the original water droplets. This is rain.

The formation process of snow

When the temperature drops below zero, the water vapor in the clouds condenses into small ice crystals. During the falling process, the surrounding water vapor contacts them and crystallizes. When the gravity they bear is strong enough, they fall to the ground. This is snow.

How pressure cooker works

When the pressure cooker is working, put it on the fire and heat it. The evaporated water vapor is still in the pot. When the temperature of the water reaches 100 degrees, it still does not boil. The temperature continues to increase until the gas pressure of the pot can lift the safety valve.

Operation:

1. When the water in the kettle is boiled, white steam can only be seen at a certain height from the small hole in the kettle lid, but no white steam can be seen close to the small hole. Why is this?

2. In the sultry summer, when you open the refrigerator, you will usually see a stream of white mist pouring out of the refrigerator. Observe how this white steam moves and explain why?

3. If the safety valve for the pressure cooker at home cannot be found, can the safety valve of another pressure cooker be used instead? Why?

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For more information about the PPT courseware "States of Matter and Changes of Matter in Life and Technology", please click the "States of Matter and Changes of Matter in Life and Technology" PPT courseware.

"Changes in the State of Matter in Life and Technology" State of Matter and its Changes PPT Courseware 5:

"Changes in the State of Matter in Life and Technology" State of Matter and its Changes PPT Courseware 5 1. Water Cycle in Nature Clouds, rain, snow, fog, dew, and frost are very common natural phenomena, and they are all occurrences of water on the earth. Formed by changes in physical state. Fog is water vapor in the air..

"Changes in the State of Matter in Life and Technology" State of Matter and its Changes PPT Courseware 4:

"Changes in the State of Matter in Life and Technology" State of Matter and Its Changes PPT Courseware 4 [Observe] The existence form of water in nature, and recall the formation process. Ice, snow, rain, dew, clouds, fog, frost, hail [Exploration] 1. The formation of clouds Clouds: water vapor condenses into small ice crystals or liquefies..

"Changes in the State of Matter in Life and Technology" State of Matter and its Changes PPT Courseware 2:

"Changes in the State of Matter in Life and Technology" State of Matter and Its Changes PPT Courseware 2 Preview Tips Do you know how the white clouds in the blue sky are formed? What's the matter with the heavy fog you encountered? Do you know how dew and frost are formed? You know rain, snow, frost...

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Update Time: 2024-07-11

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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