"Combustion and Fire Extinguishing" Changes in Matter PPT Courseware 2 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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"Combustion and Fire Extinguishing" Changes in Matter PPT Courseware 2
Activity 1 Combustion of matter
Where is combustion used in daily life?
Burnable substances Examples of utilization
Liquefied petroleum gas for cooking and cooking
Wood, leaves, boiling water, heating
candle lighting
Substances that can burn are called combustibles. Combustibles are the primary condition for combustion.
Activity 2 Reasons for extinguishing
Cover one of the burning candles with a beaker and describe in your own words what happened? What does it mean?
Experimental phenomena
The candle exposed in the air kept burning, while the flame of the candle in the beaker gradually became smaller and finally went out.
in conclusion
Candles will not burn without oxygen. Combustion requires oxygen.
Expand to make charcoal burn more vigorously
In order to make the charcoal stove burn more vigorously, what aspects should be considered?
① Increase the concentration of oxygen
② Increase the contact area between combustibles and oxygen
discuss
How to put out a fire
1. Remove other oil drums
2. Disconnect the power and cover with sand
3. Use a fire extinguisher
4. Use water to extinguish fire
【Daily life】
1. If the oil in the pot catches fire while cooking, how to put out the fire?
Cover the pot with a lid to seal out air and extinguish the fire.
2. If the alcohol lamp is accidentally knocked over and the alcohol burns on the table, how should you put out the fire?
Use a wet rag to cover the combustibles. This will keep the air out of the combustibles and allow the water to absorb heat and lower the temperature of the combustibles.
3． One of the most effective ways to put out forest fires is to cut down a patch of trees in front of the fire's path. Do you know why?
Remove flammable materials.
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