"The "Power" of Air" Pressure PPT Courseware 3

Description

"The "Power" of Air" Pressure PPT Courseware 3

1. Review

Question 1: Liquid pressure? What causes it?

Question 2: What is the formula for density and liquid pressure?

2. New Lesson:

Question 3: What is the atmosphere? Calculate the mass of air that fills the classroom? Analyze the causes of atmospheric pressure?

Question 4: Demonstrate the experiment of pouring cold water into a tin can? What is the principle of the phenomenon?

Question 5: What is atmospheric pressure?

Question 6: What does the Magdeburg hemisphere indicate?

Question 7: How can we measure the atmospheric pressure?

Torricelli's experiment proved:

The atmospheric pressure value is 760mm mercury, which is about 1.01X105pa

Notice:

In the Torrey experiment, there must be a vacuum above the tube. The height of the mercury changes with the change of the external atmospheric pressure. It has nothing to do with the thickness of the tube, the angle of inclination, the length of the tube, and whether it is lifted or pressed down. It is only related to the vertical height of the mercury column. .

3. Application: Information window

1. Reading: "Magdeburg Hemisphere" in the Human Body

Why doesn't the femur fall out of the hip bone?

There is no air between the femur and hip bone. The two form a natural "Magdeburg hemisphere". The femur is mainly connected to the body by the surrounding atmospheric pressure and ligaments.

2. When the fountain pen absorbs ink, when you press the spring leaf on the pen a few times, the ink will be absorbed into the rubber tube. why is that?

When the spring leaf on the pen is pressed a few times, the air in the rubber tube is squeezed out, and its pressure is reduced, lower than the outside air pressure. The ink enters the rubber tube under the action of atmospheric pressure.

try 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.

1. The designer of the Magdeburg Hemisphere Experiment is ( )

A Otto • Glick C Torricelli

B Magdeburg D Galileo

2. Layer sand on the bottom of the jar, light the cotton soaked in alcohol and put it into the jar. After a while, put the peeled cooked egg on the mouth of the jar, then the egg will ( )

A bounce up C slowly enter the bottle

B Stay in place D All of the above are possible

3. When using a fountain pen to absorb ink, just press and release the spring leaf a few times, and the ink will be absorbed into the rubber tube. This is because ( )

A The rubber tube has suction C The effect of atmospheric pressure

B The spring leaf has suction. D The vacuum in the rubber tube has suction.

Summary

1. The pressure of the atmosphere on objects immersed in it is called atmospheric pressure

2. The Magdeburg Hemisphere Experiment designed by Otto Glick proved the existence of atmospheric pressure.

3. Torricelli’s experiment measured the value of atmospheric pressure, which is about 105 Pa.

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For more information about the "The Power of Pressure Air" PPT courseware, please click the "Pressure ppt The Power of Air ppt" tag.

"The "Power" of Air" Pressure PPT Courseware 4:

"The Power of Air" Pressure PPT Courseware 4 There is pressure inside the liquid in all directions. This is due to the gravity and fluidity of the liquid. So, air is also subject to gravity and has fluidity. Is there atmospheric pressure in all directions around us? Learn about the atmosphere ..

"The "Power" of Air" Pressure PPT Courseware 2:

"The Power of Air" Pressure PPT Courseware 2 Small Experiment Spread a layer of sand on the bottom of a wide-mouth bottle, put a lit alcohol cotton ball into it, and plug the mouth of the bottle with a peeled cooked egg. Please observe what happened? Phenomenon: First the flame is extinguished, and then the egg is slowly swallowed into the bottle..

"The "Power" of Air" Pressure PPT Courseware:

"The Power of Air" Pressure PPT Courseware Learning Objectives 1. Understand the causes of atmospheric pressure, be able to give examples of the existence of atmospheric pressure, and use atmospheric pressure to explain simple phenomena 2. Know the Torricelli experiment and the size of standard atmospheric pressure 3. Know The amount of atmospheric pressure can...

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Update Time: 2024-09-15

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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