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"It's Raining" What will the weather be like tomorrow PPT courseware
Use your brain
Rain is a common weather phenomenon. Please think about it, what is the scene like before and during the rain?
Guess: How is rain formed?
The water turns into water vapor due to evaporation and "runs" into the air.
Water vapor is a colorless, odorless, transparent gas.
Thinking: Why do wet clothes dry out?
The formation of "rain"
1. Use a match to light the alcohol lamp and do not let the beaker burn dry.
2. After the experiment is stopped. Carefully take out the alcohol lamp. Do not blow out the alcohol lamp with your mouth. When extinguishing the alcohol lamp, cover it with the lamp cap, then lift the lamp cap and cover it again. Carefully remove the beaker. Do not touch the tripod and asbestos net directly with your hands to avoid burns. Wait for the equipment to cool down before moving the equipment carefully.
Precautions:
1. Handle experimental instruments with care to prevent damage and burns.
2 Pay special attention to safety when using the alcohol lamp. The match used to light the alcohol lamp must be extinguished and put into the waste basin. After the experiment, use the alcohol lamp cap to extinguish the alcohol lamp.
3. When using a test tube clamp to clamp a glass piece, hold the long handle with your four long fingers and the short handle with your thumb.
4 During the experiment, observe carefully and the recorder will record the experimental phenomena and conclusions.
5 After the experiment is completed, the team leader will return the equipment to its original position.
My conclusion:
Under heating conditions, water quickly forms water vapor when heated. As the water vapor rises, it encounters cold glass pieces and condenses into small water droplets. The small water droplets gather and fall down.
Think about how rain is formed in nature?
1. The water in the beaker is equivalent to the water in rivers and lakes.
2. The sun is equivalent to an alcohol lamp
3. Ice is equivalent to cold air in the sky.
4. The small water droplets under the glass plate are equivalent to the clouds in the sky.
expand
What else do you know about rain? Such as heavy rain, heavy rain, moderate rain, light rain, freezing rain, etc. Please look up relevant information after class and then communicate with your classmates.
Development and activities
What did you gain from today’s study?
Write a short scientific paper "Travel Notes of Little Water Drops"
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For more information about the PPT courseware "What will the weather be like tomorrow, will it rain?", please click the tag "What will the weather be like tomorrow, will it rain?" ppt.
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