"Atmospheric Pressure" Pressure PPT courseware 4

Description

"Atmospheric Pressure" Pressure PPT courseware 4

There is pressure inside a liquid in all directions due to the gravity and fluid nature of the liquid.

So, air is also subject to gravity and has fluidity. Is there atmospheric pressure in all directions around us?

learning process:

1. Does the atmosphere have pressure?

2. Causes of atmospheric pressure:

3. Is the atmospheric pressure high?

4. How big is the atmospheric pressure?

5. Changes in atmospheric pressure:

Learn from the sea and pick up shells

Is the air quality?

The earth we live on is a blue planet. Thick gases surround the solid land, nourishing and protecting life on Earth. The thick layer of gas is usually called the atmosphere.

In the atmosphere, the air below is pressed by the air above, and the earth is pressed by the entire atmosphere. Air has mass, and under the action of the earth's gravity, it will generate pressure on the area it acts on.

Why does atmospheric pressure occur?

1. Atmospheric pressure

1. Cause: Because the air is affected by gravity.

2. Objects immersed in the atmosphere are subject to the pressure generated by the atmosphere.

Why can't the two leather bowls be easily pulled apart?

explain:

1. Squeeze out the air in the leather bowl, and the air pressure inside will decrease.

2. The air pressure in the leather bowl is less than the atmospheric pressure.

3. Due to the strong atmospheric pressure, the two leather bowls are pressed together tightly, so the two leather bowls are not easily pulled apart.

changes in atmospheric pressure

1. A standard atmospheric pressure 1.013x105Pa or 760mm mercury

2. Atmospheric pressure decreases as altitude increases

3. The higher the air pressure on the liquid surface, the higher the boiling point of the liquid; conversely, the lower the air pressure, the lower the boiling point of the liquid.

4. The relationship between gas pressure and gas volume: Under the condition of constant temperature, for a certain mass of gas, its pressure increases when its volume decreases; its pressure decreases when its volume increases.

What did you learn?

1. Through activities, we know that there is atmospheric pressure around the earth and understand the causes of atmospheric pressure.

2. The Magdeburg Hemisphere Experiment designed by Otto Glick proved that atmospheric pressure not only exists, but is also very large.

3. According to the Torricelli experiment, the value of atmospheric pressure was measured to be 1.013×105Pa. One standard atmospheric pressure is 1.013×105Pa.

4. Atmospheric pressure decreases as altitude increases

5. The higher the air pressure on the liquid surface, the higher the boiling point of the liquid; conversely, the lower the air pressure, the lower the boiling point of the liquid.

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. When the fountain pen absorbs ink, press the spring leaf on the pen a few times. The gas pressure in the pen bladder will be _________. Under the action of _________, the ink will be "sucked" into the rubber tube.

Preview homework

The following is the correct understanding of "the location where the flow velocity is greater, the pressure is smaller" is ( )

A. Only applicable to gases

B. Only suitable for liquids

C. Suitable for gases and liquids

D. Suitable for solids, gases and liquids

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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: 2024-06-26

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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