| Category | Format | Size |
|---|---|---|
| Lu Jiao Edition Eighth Grade Physics Volume 2 | pptx | 6 MB |
"Atmospheric Pressure" Pressure PPT Courseware 7
Description
"Atmospheric Pressure" Pressure PPT Courseware 7
Review of old knowledge
1. The concept of atmospheric pressure
The atmosphere exerts pressure on objects immersed in it, and this pressure is called atmospheric pressure.
2. The size of atmospheric pressure
Standard atmospheric pressure p0= 1.013×105 Pa
learning target
(1) Understand that atmospheric pressure decreases as altitude increases, and atmospheric pressure can be measured with a barometer;
(2) Understand the working process of piston pumps and centrifugal water pumps;
(3) Understand the examples of utilizing atmospheric pressure in daily life.
1. The relationship between atmospheric pressure and altitude
Observation and Experimentation
Fill a bottle with an appropriate amount of colored water. Take a clear straw with both ends open, draw a mark on the wall of the tube, pass it through the rubber stopper and insert it into the water. Blow a small amount of gas into the bottle from the tube to make the gas pressure in the bottle greater than the atmospheric pressure.
Note: The mouth of the bottle must be tightly sealed without air leakage. Do not hold the bottle directly with your hands.
Carry the bottle from the first floor to the top of the building, or from the bottom of the mountain to the top of the building, and observe the changes in the height of the water column in the straw.
in conclusion
The higher the altitude, the thinner the air and the lower the atmospheric pressure.
Notice
Changes in weather also affect atmospheric pressure. Generally speaking, the atmospheric pressure will be lower when it is cloudy and rainy, and it will be higher when the weather is sunny and dry.
2. Barometer
Barometer: An instrument for measuring atmospheric pressure
Want to discuss
The picture is a schematic diagram of the working of a piston pump and a centrifugal pump. Can you describe their working process based on these two pictures?
Summary of this lesson
What did you gain from studying this class?
1. The relationship between atmospheric pressure and altitude
The higher the altitude, the thinner the air and the lower the atmospheric pressure.
2. Barometer
Barometer: An instrument for measuring atmospheric pressure
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For more information about the "Pressure, Atmospheric Pressure, Strong" PPT courseware, please click on the Pressure ppt Atmospheric Pressure ppt tag.
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Update Time: 2024-07-01
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