"Atmospheric Pressure and Human Life" Magical Pressure PPT Courseware 2

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"Atmospheric Pressure and Human Life" Magical Pressure PPT Courseware 2

Question: Is there pressure inside the atmosphere around the Earth?

"Demonstration" - taking coins, swallowing eggs from a bottle, and filling a cup

1. Atmospheric pressure (strong):

(1) Definition: The pressure of the atmosphere on objects immersed in it.

(2) Produce: Air is affected by ________ and can ________.

(3) Proof: the famous ________ experiment; there are also cup covering experiments, suction cups, sucking drinks (ink, liquid medicine)...

2. Measurement - Torricelli experiment:

(1) Steps:

"Irrigate--block--pour--insert--vertical--put--measure"

(2) Substitution method:

P atmosphere = P mercury = ρ mercury g h mercury =

(3) Size:

P atmosphere = _____mm ​​mercury column ≈______Pa = 1 atm

(4) The vertical height of the mercury column h:

It only depends on ________; it depends on the thickness of the tube, the depth of insertion, whether it is tilted, the amount of mercury in the tank...it all depends on ______!

think:

If we use water to do the Torricelli experiment, how high can the water be supported?

3. Measuring instruments:

(1) Mercury barometer (meter):

(2) Aneroid barometer: metal box barometer

4. Estimate atmospheric pressure:

(1) Conditions: Assume vacuum, no friction, regardless of the piston's own weight

(2) Method: omitted

(3) Calculation: P atmosphere = F atmosphere/S = G/S

5. Atmospheric pressure and human life:

(1) At the same place: the atmospheric pressure ________(is?) fixed and changes with _______ and _______.

(P clear____P cloudy, P winter____P summer)

(2) Also ________ with height: increasing.

Within 2km above sea level, for every 10m of increase, approximately _____Pa decreases.

(3) Boiling point and pressure:

The boiling point of a liquid ________ as the air pressure above it increases; it ________ as the air pressure decreases.

Example: ① The pressure cooker cooks quickly - boiling point _______;

②Alpine rice is not cooked well-boiling point_______.

Consolidation Exercise 1

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.

Consolidation Exercise 2

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

A Otto Glick

B Magdeburg

C Torricelli

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

B stay still

C slowly enter the bottle

D All of the above situations 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 power

B. The spring leaf has suction force

C. Effect of atmospheric pressure

D. The vacuum in the rubber tube has suction

Exercise 3

1. The following phenomena work using atmospheric pressure: _____:

(1) The syringe draws out the medicinal liquid,

(2) Plastic coat hooks adsorbed on the glass,

(3) Fountain pen absorbs ink,

(4) Suck drinks through straws.

2. When a classmate was doing Torricelli's experiment, a small amount of air was accidentally mixed into the glass tube, and the measurement result would be ( )

A． Too big B. Too small c. equal D. It's possible

3. When performing Torricillo, the height difference between the inside and outside of the tube has been measured to be 76cm. If mercury is added to the tank to raise the mercury level by 1cm, the height difference between the inside and outside of the tube will be ______.

4． When doing the Tory fold experiment, which of the following phenomena can indicate that there must be a vacuum above the glass tube ( )

A． Press the glass tube down slightly and the mercury level inside the tube will rise.

B． Tilt the glass tube, the length of the mercury column increases, and finally fills the entire tube

C. The height difference between the mercury surface inside and outside the tube is 76cm

D． The height difference between the mercury surface inside and outside the tube is 76.5cm

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For more information about the PPT courseware "Amazing Pressure, High Pressure and Human Life", please click on the "Amazing Pressure ppt Atmospheric Pressure and Human Life ppt" tag.

"Atmospheric Pressure and Human Life" magical pressure PPT courseware:

"Atmospheric Pressure and Human Life" Magical Pressure PPT Courseware Teaching Objectives: Know the existence of pressure in the atmosphere and the causes of its occurrence. Understand the Torcolli experiment, and know the value of a standard atmospheric pressure. Understand the relationship between atmospheric pressure and boiling point Understand the relationship between atmospheric pressure and human life...

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Update Time: 2024-10-22

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume 2 industry PPT template

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