"Three State Changes of Water" PPT download of changes in temperature and water

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"Three State Changes of Water" PPT download of changes in temperature and water

Part One: Importing New Knowledge

Do you remember ice? Is it a solid, liquid, or gas?

What about water?

Now that we have solids and liquids, what is missing?

Today we will learn about the three-state changes of water

PPT on the three-state changes of water, part 2: new knowledge explanation

1. Various forms of water

Have you ever seen fog? Have you ever observed dewdrops on grass blades?

At what time of day can we usually see fog and dew?

In what season do frost and snow usually appear?

Are clouds and fog water vapor? Why?

Clouds and fog are not water vapor. Water vapor is invisible. Clouds and fog are visible, so they are not water vapor.

2. Three-state cycle of water

Take a guess

Can solid ice and gaseous water vapor transform into each other?

able. For example: at tens of degrees below zero in the north, when washed clothes are hung out and dried, solid ice will directly turn into gaseous water vapor.

What causes the three states of water to change? Can you use a diagram to represent the transformation between the above three?

The water in the rivers flows into the ocean day and night, but the water in the ocean is never full or overflows. The water in the rivers never stops flowing. What is the reason for this?

PPT on the three-state changes of water, the third part: knowledge expansion

Reading library

1. Understand gases, solids and liquids.

The particles of gas move away from each other and move quickly, with minimal interaction with each other.

Solid particles are packed tightly together. They are attracted to each other very well.

Particles of liquid are attracted to each other and stick together in piles.

2. Understand melting and solidification

Particles in a solid pack tightly together. But after heating, the particles vibrate more and more violently until they can move freely. Solid becomes liquid.

After the candle is blown out, the wax oil will quickly solidify into a solid. This is because the heat emitted by the flame causes the particles to accelerate and become a liquid. After the heat is dissipated, the particles slow down and solidify again.

PPT on the three-state changes of water, part 4: Consolidation exercises

1. Dew and fog generally appear at ------- (fill in "morning" or "evening") of the day, and they belong to the form of water ------- (fill in "liquid" or "solid").

2. Frost and snow generally appear in ———— (fill in “winter” or “summer”), and they belong to the —————— (fill in “gas” or “solid”) form of water.

True or False

(1) After the rain and the weather clears, the water on the ground dries up, which is a phenomenon of condensation. ( )

(2) The appearance of dew on grass blades in the morning is due to evaporation. ( )

(3) Fog is small water droplets formed by condensation of water vapor at low altitude. ( )

Multiple choice questions

1. People often say that if it snows and it doesn’t get cold, the snow becomes cold. This is because( )

A． Snow absorbs heat when it melts, so people feel cold;

B. When it snows, the temperature is above 0℃, so it’s not cold when it snows;

C. When it snows, it releases heat so people don't feel cold.

2. Among the following statements, the incorrect one is ().

A． Water comes in three forms: solid, liquid and gas

B. Dew is liquid water, fog is gaseous water, and frost is solid water.

C. The three forms of water can transform into each other

Three-state changes of water PPT, Part 5: Class summary

1. Solid state: ice, snow; liquid state: rain, dew, water, fog, clouds; gaseous state: water vapor

2. The process of water form change and the conditions for change

3. The three-state changes of water mainly depend on changes in temperature.

Three-state changes of water PPT, part 6 content: blackboard design

1. Various forms of water

1. Solid state: ice, snow; liquid state: rain, dew, water, fog, clouds; gaseous state: water vapor

2. The process of water form change and the conditions for change

2. Three-state cycle of water

1. The three-state changes of water mainly depend on changes in temperature.

Keywords: Free download of Chinese PPT courseware for the second volume of the third grade of the textbook version, PPT download of the three-state changes of water, PPT download of changes in temperature and water, .PPT format;

For more information about the PPT courseware "Changes in Temperature and Water Three-State Changes in Water", please click on the Changes in Temperature and Water ppt Three-State Changes in Water ppt tag.

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Update Time: 2024-09-30

This template belongs to science courseware Third Grade Science Volume 2, Textbook Edition industry PPT template

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