| Category | Format | Size |
|---|---|---|
| Beijing Normal University eighth grade physics volume one | pptx | 6 MB |
"Sublimation and Sublimation" State of Matter and Its Changes PPT Courseware 2
Description
"Sublimation and Sublimation" State of Matter and Its Changes PPT Courseware 2
Sublimation: The process by which matter changes directly from solid to gaseous state.
Sublimation: The process by which matter changes directly from gaseous to solid state.
discuss:
Why do the filaments of ordinary light bulbs and fluorescent lamps become thinner after being used for a long time? Why do glass walls turn black?
The filament material of ordinary light bulbs is tungsten. When the light bulb is working, the filament temperature is very high. The tungsten constituting the filament sublimates at high temperatures, causing the filament to become thinner. Tungsten vapor continuously condenses on the wall of the bulb, causing the glass wall to turn black.
The "ice flowers" on windows in winter are formed by the condensation of water vapor in the air
Application: artificial rainfall
When the clouds are suitable, airplanes can be used to sow dry ice over the clouds. The dry ice absorbs heat during the sublimation process, causing the water vapor in the clouds to turn into small ice particles. These ice particles turn into water droplets as they fall and become rain.
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For more information about the "Sublimation and Sublimation States of Matter and Their Changes" PPT courseware, please click the Sublimation and Sublimation ppt State of Matter and its Changes ppt tag.
"Sublimation and Sublimation" Material Forms and Changes PPT Courseware 3:
"Sublimation and Sublimation" Material Forms and Changes PPT Courseware 3 Review Review 1. What are the conversion processes between solid and liquid called? Endothermic or exothermic? The change of matter from solid to liquid is called melting, which is an endothermic process. ; The change of substance from liquid to solid is called solidification..
"Sublimation and Sublimation" Material Form and Its Changes PPT Courseware 2:
"Sublimation and Sublimation" Material Forms and Changes PPT Courseware 2 Learning Objectives 1. Know what sublimation and sublimation are, and understand the phenomena of sublimation and sublimation in life 2. Know that sublimation absorbs heat and sublimation releases heat 3. I am willing to explore the phenomena of sublimation and sublimation in life and appreciate...
"Sublimation and Sublimation" Material Forms and Changes PPT Courseware:
"Sublimation and Sublimation" Material Forms and Changes PPT Courseware Teaching Objectives 1. Know what sublimation and sublimation are, and understand the phenomena of sublimation and sublimation in life. 2. Know that sublimation needs to absorb heat and sublimation needs to release heat. 3. Understand and sublimate through experiments, observation and analysis..
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Update Time: 2024-08-02
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