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Authoritative PPT Summary
"Boiling Water" Drinking Water PPT Courseware
1. Review import
Can purified water be drunk directly? How to get drinkable water? The most common method is to boil water. Only water that has been purified and sterilized by high temperature can be consumed.
Use of alcohol lamp
2. Experimental research
Precautions for use
①The wick of the alcohol lamp should be flat.
② When adding alcohol, it should not exceed 2/3 of the volume of the alcohol lamp; the alcohol should not be less than 1/4.
③It is absolutely prohibited to add alcohol to a burning alcohol lamp to avoid fire.
④ It is absolutely prohibited to use an alcohol lamp to ignite another alcohol lamp.
⑤After using up the alcohol lamp, you must cover it with the lamp cap and do not blow it with your mouth.
⑥Do not knock over the alcohol lamp. If the spilled alcohol burns on the table, cover it with a damp cloth immediately.
Observe and think:
①What will happen when the water is boiled?
②When can we say "the water is boiling"?
boil water
When it first starts burning, the water surface will gradually rise and the bottom of the water will gradually bubble. When heated for a certain period of time, "white steam" will appear on the water surface.
When the water temperature is between 0 and 100°C, both the water surface and the water temperature will rise. If heating continues after the water temperature reaches 100°C, the water temperature will no longer rise and the water volume will gradually decrease.
Boiling point: Normally, water will "boil" when it reaches 100°C. The temperature at which water boils is called the boiling point of water.
3. Draw a line chart of water temperature changes when boiling water
4. Knowledge expansion
He has a lot of knowledge about "boiling water"! ! for example:
1. In some places, the water is boiling but the rice cannot be cooked. Why?
2. Is it okay to "boil the sea into salt"?
3. What happened to the magic trick?
4. Can paper pots also be used to boil water?
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