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Authoritative PPT Summary
"Water and Water Vapor" Changes in Temperature and Water PPT
Part One: Importing New Knowledge
Where does the water on the side of the cup come from?
After it rains, there will be some puddles on the ground. The weather cleared up and the water in the puddles dried up quickly.
Where did the water in the puddle go?
The water has seeped into the soil!
Is what she said completely correct?
Let's do an experiment to explore it together. How to do it?
Water and water vapor PPT, part 2: new knowledge explanation
1. Where did the water go?
1. Experimental steps:
(1) Each group pours a little water into a shallow dish and marks the water surface with a pen.
(2) Place the dish filled with water in the sun. After a while, observe the changes in the amount of water in the dish.
Guess: Based on your existing life experience, students, please guess first, will the water in the dish decrease?
The water in the shallow dish is partially reduced; no water leaks out of the dish.
The water neither flows out nor penetrates into the dish, so how can it be reduced?
Conclusion: Water turns into water vapor invisible to our naked eyes and enters the air.
2. Evaporation
The process of turning water into water vapor is called evaporation.
Note: The particles of water vapor are too small for us to see.
Take a guess
Think and discuss: After the water is boiled, is the white steam coming out of the kettle water vapor? Why? what is it?
The white steam coming out of the kettle is not water vapor. Because the particles of water vapor are too small for us to see, but white vapor can be seen, so it is not water vapor but small mist-like water droplets.
2. Can heating speed up water evaporation?
Take a guess
Under what circumstances does water evaporate faster?
What should you do to speed up the evaporation of water in your life?
give it a try
Wipe the table with a damp cloth and let it dry naturally. At the same time, ask a classmate to fan the table and see which side dries faster.
experiment procedure
(1) Take two identical stainless steel long-handled spoons and add 2/3 tablespoons of water to both.
(2) Place one of the spoons so that the mouth of the spoon is horizontal;
(3) Light the candle and place the other one on the candle flame to heat.
(4) Observe the changes in the water in the spoon. Which spoon evaporates faster?
Water and water vapor PPT, Part 3: Consolidation exercises
1. Fill in the blanks
1. Under sunlight, water turns into _________ which is invisible to our naked eyes and then enters the air.
2. The process of turning water into water vapor is called ________.
3. Wipe the blackboard with a damp cloth. The water will dry after a while. This is a ___________ phenomenon.
2. Judgment of the Little Judge
1. Water in rivers, lakes and seas is evaporating all the time. ( )
2. The speed of water evaporation has nothing to do with the surrounding temperature. ( )
3. Steam turns into small water droplets when heated. ( )
3. Choice
1. Because the water in rivers and seas is constantly in ( ), the air is filled with water vapor.
A． condensation
B. evaporation
C. melt
2. Water vapor can condense into small water droplets under ( ) conditions.
A． catch cold
B. heated
C. absorb heat
Water and water vapor PPT, Part 4 content: Class summary
1. The process of turning water into water vapor is called evaporation. Because the particles of water vapor are too small, we cannot see them.
2. Heating can speed up the evaporation of water. Water evaporates under any circumstances, and evaporation accelerates as the temperature increases
3. Water vapor cools and turns into visible water droplets. This phenomenon is called condensation.
Water and water vapor PPT, part 5: writing on the blackboard
1. Where did the water go?
The process of turning water into water vapor is called evaporation.
Because the particles of water vapor are too small, we cannot see them.
2. Can heating speed up water evaporation?
Heating can speed up the evaporation of water.
Water evaporates under any circumstances, and higher temperatures accelerate evaporation.
3. Water in the air
Water vapor will turn into rain and fall
The cooling of water vapor into visible water droplets is called condensation.
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