"Atmospheric Pressure" Pressure PPT Courseware 6

Description

"Atmospheric Pressure" Pressure PPT Courseware 6

learning target

(1) Understand that atmospheric pressure exists objectively;

(2) Understand the experiment to measure atmospheric pressure-Torricelli experiment;

(3) Understand the value of atmospheric pressure and the unit of atmospheric pressure.

1. The concept of atmospheric 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.

Experiment 2

If you poke a small hole in a plastic suction cup, what experimental phenomenon will you see?

Phenomenon: After a period of time, the plastic suction cup falls off

Analysis: Without the pressure generated by the air on the outside of the suction cup, the suction cup cannot stick to the surface of the object.

Experiment 3

How does the drink get into your mouth? If the mouth of the beverage bottle is sealed, can the beverage still enter the mouth?

Analysis: After sealing, the atmosphere can no longer enter the bottle and no pressure difference can occur.

2. The size of atmospheric pressure

In Experiment 1, if the maximum height at which atmospheric pressure can hold up a water column can be found, then the pressure generated by the water column is equal to the atmospheric pressure.

The water column is too high, use mercury instead

Torricelli experiment

1. The first person to measure atmospheric pressure was Italian scientist Torricelli

Atmospheric pressure value

p atmosphere = p mercury

=rmercury gh

=13.6×103 kg/m3×9.8 N/kg×0.76 m

=1.013×105 Pa

Standard atmospheric pressure p0= 1.013×105 Pa

A rough calculation of standard atmospheric pressure can be taken as 105 Pa

Summary of this lesson

What did you gain from studying this class?

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

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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: 2024-11-03

This template belongs to Physics courseware Lu Jiao Edition Eighth Grade Physics Volume 2 industry PPT template

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