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"Water and Water Vapor" Changes in Temperature and Water PPT Courseware 3
After it rains, there will be some puddles (stagnant water) on the ground. The weather cleared up and the water in the puddles dried up quickly. Where did the water in the puddle go?
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.
The process of water vapor turning into water is called condensation.
Under what conditions does water turn into water vapor? Under what circumstances does it evaporate faster?
The higher the temperature, the faster water evaporates.
When the wind blows, water evaporates quickly.
The drier the air, the easier it is for water to evaporate.
Will water vapor turn back into water?
The vapor evaporated from the water will cool down when it encounters the colder glass and turn into visible water droplets.
Water vapor in the air cools and turns into visible water droplets. This phenomenon is called condensation.
Choose you, me and him
1. The phenomenon of water turning into water vapor is called ( )
A. Evaporate B. Boil
2. Evaporation is the change phenomenon that occurs in liquid ( ).
A.Exterior B.Interior C.Surface
3. When water evaporates, it absorbs the surrounding ( )
A. Air B. Heat C. Oxygen
judge 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. ( )
4. The small water droplets on the window glass and dewdrops on the grass in summer and autumn are all condensation phenomena. ( )
Do you know why?
A glass filled with ice is placed in the air. After a while, many small water droplets appear on the outside of the glass. Where do these water droplets come from?
The water vapor in the air will condense into small water droplets on the wall of the glass when it encounters the colder glass.
tips
100°C water vapor causes more serious burns than 100°C water
Because when 100°C water vapor meets the human body, it will first liquefy into 100°C water. At this time, a large amount of vaporization heat will be released, and this part of the heat is the most important heat for scalding people. It is more and faster than the heat transferred to people through thermal conduction by 100°C water, so burns caused by water vapor are more serious.
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"Water and Water Vapor" Changes in Temperature and Water PPT:
"Water and Water Vapor" Temperature and water changes PPT Part 1: Introduction of new knowledge Where does the water on the wall 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? Water seeps into...
"Water and Water Vapor" Changes in Temperature and Water PPT Courseware 2:
"Water and Water Vapor" Temperature and water changes PPT courseware 2 Observing water vapor Experiment requirements: Place the container of water on the table and carefully observe the characteristics of water vapor. Group members can discuss with each other. Tips: You can observe by smelling, looking, touching, etc..
"Water and Water Vapor" Temperature and water changes PPT courseware:
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