| Category | Format | Size |
|---|---|---|
| Beijing Normal University eighth grade physics volume one | pptx | 6 MB |
"Vaporization and Liquefaction" State of Matter and Its Changes PPT Courseware 4
Description
"Vaporization and Liquefaction" State of Matter and Its Changes PPT Courseware 4
Vaporization
The phenomenon of matter changing from liquid to gaseous state is called vaporization
There are two ways of vaporization: evaporation and boiling
evaporation
Only occurs on the surface of liquids
Can occur at any temperature
slow vaporization
Needs to absorb heat and has cooling effect
Factors affecting evaporation speed
liquid temperature
size of liquid surface area
How fast air moves near the surface of a liquid
boiling phenomenon
The bubbles are small before boiling and become larger when boiling
The sound is louder before boiling and becomes quieter when boiling
The temperature rises before boiling. Continue heating until it reaches a certain temperature and boils without changing the temperature.
Stop heating, no more boiling
The temperature at which a liquid boils is called the boiling point. The boiling point of water at standard atmospheric pressure is 100°C
think
Observe the table "Boiling Points of Several Liquids" on page 58 and answer the following questions
When boiling eggs, they will not burn as long as the water is dry, but when frying eggs, the eggs will burn even if the oil is not dry. Why is this?
Answer: The boiling point of oil is higher than the boiling point of water.
Can I use an alcohol thermometer to measure the temperature of boiling water? Why?
Answer: No, the boiling water temperature is 100°C and the boiling point of alcohol is 78°C. If you use an alcohol thermometer to measure the boiling water temperature, the alcohol will vaporize, so it cannot.
liquefaction
The moist and warm air in the bottle rises. When it encounters cold near the mouth of the bottle, the water vapor condenses into water
The phenomenon of a substance changing from a gaseous state to a liquid state is called liquefaction. When liquefied, the gas will release heat.
There are two ways to liquefy a gas: lowering the temperature and compressing the volume.
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For more information about the PPT courseware "Vaporization and Liquification States of Matter and Their Changes", please click the Vaporization and Liquification ppt State of Matter and Their Changes ppt tag.
"Exploring the Characteristics of Vaporization and Liquefaction" Material Forms and Their Changes PPT Courseware 2:
"Exploring the Characteristics of Vaporization and Liquefaction" Material Forms and Changes PPT Courseware 2 Learning Objectives 1. Be able to distinguish between solid, liquid and gaseous states of matter. Know what vaporization and liquefaction are. Know that vaporization absorbs heat and liquefaction releases heat. 2. Know what evaporation is and how it affects evaporation speed..
"Exploring the Characteristics of Vaporization and Liquefaction" Material Forms and Their Changes PPT Courseware:
"Exploring the Characteristics of Vaporization and Liquefaction" Material Forms and Changes PPT Courseware Teaching Objectives 1. Describe the basic characteristics of the three physical states of solid, liquid and gas. List the different states of matter in nature and life and their applications. 2. Know what vaporization and liquefaction are, know vapor...
"Vaporization and Liquefaction" PPT Courseware on Changes in State of Matter 10:
"Vaporization and Liquefaction" PPT Courseware on Changes in State of Matter 10 Think about it. Put a few drops of alcohol into a transparent plastic bag; deflate the bag, drain out the air and tie the mouth tightly with a rope; then put it into a hot pot above 80℃ in water. What changes will you see? Remove the plastic bag from the hot water..
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Update Time: 2024-07-29
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