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"Characteristics of Hot Air" Water Cycle in Nature PPT Courseware
flowing air
You can't see the air, but it changes a lot, there are lots of fun little games, and you know the wind strength and direction.
How do you feel when you untie an inflated balloon and hold the mouth of the balloon toward your face? What does it mean?
Air will flow.
Air will rise when heated
in conclusion:
Hot air is above the candle flame.
Experiment 2: What phenomena are observed?
Phenomenon: The paper snake rotates
Design an experiment to observe the convection of hot and cold air.
Phenomenon: Put a cold bottle upside down on a hot bottle with smoke. After removing the glass piece, the smoke in the hot bottle rises and flows into the cold bottle, flowing in all directions, then sinks to the hot bottle, and then rises again, and so on. Circular flow fills both the cold and hot bottles with smoke.
Conclusion analysis: The hot bottle is filled with hot air. The hot air rises. The cold air in the cold bottle sinks and flows to the hot bottle to supplement the space left by the hot air. The hot air is cooled while flowing in the cold bottle. Therefore, sink. This creates a circulating flow of air in the hot and cold bottles.
Cold air flows in the direction of hot air to form wind
The air pressure is low where the temperature is high, and the pressure is high where the temperature is low. Cold air with high pressure flows in the direction of hot air with low pressure, creating wind.
Measure wind direction Measure wind force
Talk about it
What method can be used to compare wind strength?
Weather station wind direction, wind force gauge
Cold air flows in the direction of hot air to form wind
Experiments have shown that wind is formed under the conditions of differences in hot and cold air. The air in hot places rises upward, and the air in cold places flows to supplement it, thus forming wind.
The formation of land and sea breeze:
If you live by the sea for a while, you will have this experience: During the clear day, the wind often blows from the sea; and at night, the wind blows from the land to the sea. This kind of wind that appears in regular cycles is what is called sea and land breeze in meteorology. During the day, the land is heated by solar radiation. The air above the land heats up rapidly and rises upward. Due to its thermal characteristics, the sea surface heats slowly, so the temperature above it is relatively cold. The cold air sinks and flows near the surface to the nearby hotter land. surface, filling the vacancy caused by the rising hot air there, forming a sea breeze; the land cools quickly at night, the sea is warmer, and the near-surface airflow blows from the land to the sea, which is called land breeze.
Keywords: Water cycle teaching courseware in nature, teaching courseware on the characteristics of hot air, PPT courseware download for the sixth grade of the People's Education Press, Vol. Download, .PPT format;
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"Characteristics of Hot Air" Water Cycle in Nature PPT Courseware 2:
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