| Category | Format | Size |
|---|---|---|
| People's Education Edition Physics for Grade 8, Volume 2 | pptx | 6 MB |
"Atmospheric Pressure" Pressure PPT courseware
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"Atmospheric Pressure" Pressure PPT courseware
Review Question: Please review the characteristics of liquid pressure.
We live at the bottom of the atmosphere, so does the atmosphere have pressure in all directions?
If so, what do you think are the characteristics of atmospheric pressure?
Can you give some experiments or examples to prove your point?
experiment one
1. Place a hard plastic piece flat on the mouth of a flat plastic cup, hold it down with your hand, and turn it upside down. What will you see after you let go?
Analysis: If there is pressure in the atmosphere, the pressure on the upper and lower sides of the hard plastic piece will be equal, and the paper piece will fall under the action of gravity. The result is the same if there is no pressure in the atmosphere.
2. Fill a plastic cup with water, cover the mouth of the cup with a hard plastic piece, hold it down with your hand, and turn it upside down. What will happen after you let go?
3. Changes in atmospheric pressure
Hold a homemade barometer from downstairs to upstairs and observe the changes in the height of the water column in the glass tube.
Atmospheric pressure decreases with altitude.
The law of atmospheric pressure changes: Within an altitude of 3 000 m, for every 10 m of elevation, the atmospheric pressure decreases by approximately 100 Pa.
Consolidate practice
1. Since the air is also affected by the _____ force and can flow, there is pressure inside the air in the _______ direction.
2. The pressure exerted by the atmosphere on objects immersed in it is called ___________, or __________ for short.
3. The famous ____________ experiment effectively proved the existence of atmospheric pressure. This experiment was conducted by ____________.
4. The famous experiment to measure the atmospheric pressure is the ___________ experiment. The atmospheric pressure is about __________ Pascals.
5. In the experiment of measuring the atmospheric pressure value, the thickness of the glass tube used and the measurement result are __________. It should be placed vertically during the experiment. If the glass tube is tilted, the length of the mercury column in the tube will be __________, and the vertical height of the mercury column will be ___________.
6. If water is used to perform the Torricelli experiment, there is a vacuum above the tube, and the atmospheric pressure can support a water column about _________ meters high.
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"Atmospheric Pressure" pressure PPT teaching courseware:
"Atmospheric Pressure" pressure PPT teaching courseware Part 1: Classification practice of knowledge points Knowledge point 1 The existence of atmospheric pressure 1. The __________ experiment was the first to prove the existence of atmospheric pressure. Atmospheric pressure is referred to as _______ or ______. Caused by atmospheric pressure...
"Atmospheric Pressure" Pressure PPT download:
"Atmospheric Pressure" Pressure PPT download Part 1 content: Basic knowledge points Basic knowledge point 1 The existence of atmospheric pressure 1. In the experiment as shown in the figure, the existence of atmospheric pressure cannot be explained (D) 2. Among the following phenomena, the existence of atmospheric pressure is (D) B) A. Use an air extractor to extract...
"Atmospheric Pressure" Pressure PPT:
"Atmospheric Pressure" Pressure PPT Part One: Preview Perception 1. The existence of atmospheric pressure 1. Cause: The atmosphere is affected by gravity and has fluidity. 2. Features: The atmosphere has pressure in all directions. 3. Phenomenon: sucking drinks through straws, cup-covering experiments, plastic sucking...
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Update Time: 2024-07-02
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