"Three State Changes of Water" Changes in Temperature and Water PPT Courseware 2

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"Three State Changes of Water" Changes in Temperature and Water PPT Courseware 2

Please think carefully about the form in which water exists around us in nature.

think:

What state of water do they belong to?

fog cloud rain dew frost snow ice water vapor

Water has three forms in nature. How do they change?

At what point does water start to freeze?

The temperature at which water freezes is the "freezing point" of the water.

Water has three different forms in nature: ice, water, and water vapor. When ice melts and water evaporates, heat is absorbed; when water freezes and water vapor turns into water, heat is released. The three-state changes of water mainly depend on changes in temperature.

Three-state changes of water and life

What is the relationship between the three states of water and our lives? How do people use the three-state changes of water in life?

1. Fill in:

1. The temperature at which water freezes is the _______ of the water.

2. It takes _______ for ice to turn into water or water vapor.

3. Water has three states: liquid, gas, and solid. Ice is water in the ____ state; water vapor is water in the ____ state.

4． The main factors that affect the changes in the three states of water are _______.

2. Be a good little judge:

(1) The three states of liquid, gaseous and solid water can transform into each other under certain conditions. ( )

(2) Water vapor can directly turn into ice, but ice cannot directly turn into water vapor. ( )

(3) Put a piece of ice there and it will never decrease as long as it does not turn into water. ( )

(4) Under normal circumstances, water can freeze at 0°C and below. ( )

(5) The three-state changes of water are very closely related to our lives. ( )

This is because ice turns into water vapor when blown by the wind

Earlier we knew that water vapor can be converted into water, and water can be converted into water vapor and ice. Now we know that ice and water vapor can also be converted into each other.

Summary: The water in rivers, lakes and seas on the earth is evaporated by sunlight and turns into water vapor in the air. It accumulates more and more, forming rain in summer and snow in winter before returning to the earth. It is because of this water cycle that the water in rivers, lakes and seas neither overflows nor flows out completely. ——Matter is in motion and the law of immortality of matter

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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.

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

"Three State Changes of Water" Temperature and water changes PPT download Part 1: Introduction of new knowledge Do you still 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 states of water...

"Three State Changes of Water" Changes in Temperature and Water PPT:

"Three State Changes of Water" Temperature and Water Changes PPT Part One: Various Forms of Water Water has various forms in nature, sometimes liquid, sometimes solid, and sometimes gaseous. Based on the phenomena we have observed and our existing life experiences, let’s talk about it...

"Three State Changes of Water" PPT courseware:

The first part of the "Three State Changes of Water" PPT courseware content: Changes in the form of water. The process of water form change and the conditions for change. Ice crystals formed when frost water vapor solidifies on objects. When the temperature drops below 0°C, water vapor turns into ice crystals at high altitudes in snow. The temperature drops below 0 ℃..

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Update Time: 2024-11-22

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

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