| Category | Format | Size |
|---|---|---|
| Qingdao Edition Fourth Grade Science Volume 1 | pptx | 6 MB |
"Three State Changes of Water" PPT courseware
Description
"Three State Changes of Water" PPT courseware
Part One: Changes in Water Forms
The process of water form change and the conditions for change
Frost: Ice crystals where water vapor solidifies on an object. The temperature drops below 0°C.
Snow. Ice crystals formed by water vapor at high altitude. The temperature drops below 0℃.
Ice water turns into ice and the temperature drops below 0°C
Dew: water vapor condenses into small water droplets on objects when exposed to cold. The temperature drops (above 0°C).
Cloud Water vapor is condensed into small water droplets floating in the sky. The temperature drops (above 0℃)
Fog: Water vapor condenses into small water droplets floating in low altitude. Temperature drops (above 0℃)
Liquid water can form solid ice, and solid ice can turn back into liquid water; liquid water can evaporate into gaseous water vapor, and gaseous water vapor can condense into liquid water.
Since water exists in three forms, it is widely used in our lives. Let’s watch a short video to find out more!
Can students give some examples from life?
Part 2 content: Class summary
1. Water exists in liquid, solid and gaseous states at the same time in nature.
2. Water constantly experiences cyclic changes in three states in nature. The cause of the three-state changes of water is the change of temperature.
3. Protecting the environment starts with me; saving water starts with every step!
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Update Time: 2024-07-02
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