"Wind and Precipitation" PPT courseware

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"Wind and Precipitation" PPT courseware

Part One: Thoughts and Discussions:

How to prove that there is water vapor in the air?

1. When you open the refrigerator, fog will appear.

2. The drink that has just been taken out of the refrigerator will start to "sweat" after being left in the air for a while.

Water vapor is present in the air at any time and anywhere

Wind and precipitation PPT, part 2: air humidity

1. Humidity refers to the amount of water vapor in the air.

(Generally expressed as relative humidity)

Relative humidity = the amount of water vapor in the air at a certain temperature/the maximum amount of water vapor that can be contained in the air at that temperature

(Commonly expressed as a percentage)

2. Measurement of relative humidity

Measuring instrument: hygrometer

Wet and dry bulb hygrometer (most commonly used), hair hygrometer, automatic induction hygrometer, etc.

Wet and dry bulb hygrometer

It consists of a dry bulb thermometer and a wet bulb thermometer.

Instructions:

①First read the temperature of the dry bulb thermometer;

②Read the temperature of the wet bulb thermometer again; calculate their temperature difference.

③Check the relative humidity table to get the relative humidity.

Wind and precipitation PPT, part 3: precipitation

Water vapor condensation falling from the atmosphere to the ground.

Water mist appears in the air in the beaker - that is, water vapor condensation occurs.

When the temperature drops to a certain level, the air's ability to hold water vapor decreases and becomes supersaturated, and water vapor condenses.

Conditions for water vapor to condense

⑴Relative humidity reaches 100%

⑵The temperature drops further

⑶There are tiny dust particles in the air

Wind and precipitation PPT, part 4 content: thinking:

How to use the "catalyst" of artificial rainfall to eliminate rain?

Before the rain clouds move in, artificial rainfall should be carried out on the clouds to move the rain to other places.

The "catalysts" for artificial rainfall include dry ice, silver iodide, water, etc.

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, wind and precipitation PPT download, .PPT format;

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"Wind and Precipitation" PPT download:

"Wind and Precipitation" PPT download part one: How is wind formed? (Note: Air flow in the vertical direction does not belong to wind) Wind is the horizontal movement of air. Wind is caused by the difference in air pressure at the same horizontal height. Caused by wind flowing from areas of high pressure..

"Wind and Precipitation" PPT:

The first part of the PPT "Wind and Precipitation": Guess the three autumn leaves that fall can bloom February flowers. Thousands of feet of waves are crossing the river, and thousands of bamboo poles are sloping into the water. "Wind" Li Qiao Think about it. Can the wind pour out of Grandma Feng's pocket? How is wind formed? Just like water flowing from high to low...

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Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 1 industry PPT template

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