"The Establishment and Function of Models and Symbols" PPT

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"The Establishment and Function of Models and Symbols" PPT

Part 1: Why use a globe?

Because the earth is too big to understand, in order to study it better, we made it into a model, that is, a globe.

Why use an eyeball model?

Because the structure of the eyeball is complex, it is difficult to express.

model approach

In natural science research, people use certain scientific methods to build appropriate models to replace and reflect objective objects, and study this model to reveal the form, characteristics and essence of objective objects.

The establishment and function of model symbols PPT, Part 2: Model

1. Examples: aircraft models, ship models, spaceship models, architectural models, miniature landscapes.

2. Function: Help people understand and understand some things that cannot be directly observed or are complex.

3. Type:

⑴Replicas of objects

⑵The process of things changing

⑶Pictures

⑷Mathematical formulas or specific words

Do you know the symbols and models that represent water?

Water is represented by the symbol "H2O", which means that it is composed of two hydrogen atoms and one oxygen atom.

Use a model to represent water molecules.

The establishment and function of model symbols PPT, the third part: symbols

1. Example: speed v, time t

2. Function:

⑴Be able to express things simply and clearly

⑵Can avoid confusion caused by different shapes of things

⑶It can avoid confusion caused by different words and languages ​​for expressing things.

How are symbols established?

Some are the first letters of the thing in English or Latin, such as speed v, mass m, etc. Some are "language" symbols abstracted from the thing, such as electric bells:

The establishment and function of model symbols PPT, the fourth part: inspiration

Using symbols and models can help us vividly understand the commonalities of things. We should establish an idea of ​​​​using symbols and models, which is very beneficial to our future study and research of science.

Exercise: Place a beaker containing a small amount of water in the air. After a few days, the water dries up and the liquid water molecules diffuse into the air one by one. If small circles are used to represent water molecules and small arrows are used to represent the direction of movement (such as ○→), can you draw a model of the diffusion of this glass of water in the air?

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume is free to download, the establishment and function of model symbols PPT download, .PPT format;

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Update Time: 2024-07-04

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

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