Qingdao Edition Fourth Grade Science Volume 2

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"Who gets hot faster" PPT courseware

Part 1: First introduction to knowledge points

Activity 1: I know the heat-absorbing ability of objects

Do it, talk about it.

1. Wear gloves of different colors to feel the difference in temperature under the sun.

2. Use a thermometer to measure the temperature in a black and white Erlenmeyer flask placed in the sun.

3. Compare the heat-absorbing ability of paper sleeves of different colors under sunlight.

Discuss as a group. What conclusions can you draw based on the experimental phenomena?

Dark-colored objects absorb heat quickly, while light-colored objects absorb heat slowly.

Who gets hot faster PPT, part 2: Application

Activity 2: Application in daily life

Eskimo igloo

Ice is a symbol of cold, and when it is mentioned, people will shudder. However, in the freezing winter, the Eskimos living in the Arctic Circle survived the harsh winter with houses made of ice.

How do Eskimo igloos keep people warm and cold?

First of all, because the igloo is strong and airtight and can keep the cold wind out of the house, people living in the igloo can be protected from the cold wind.

Secondly, ice is a poor conductor of heat and is a good insulator. The heat in the house can hardly be conducted to the outside through the ice wall.

Thirdly, the frozen igloo has no windows and an animal skin curtain is hung at the door, which can greatly reduce the convection of air inside and outside the house.

Who gets hot faster PPT, part 3: practice

Activity 3: Test you

Let me fill it in.

(1) In the sun, wearing black gloves and white gloves on both hands, the temperature felt by both hands is ________.

(2) Black objects absorb heat _____ better than white objects.

(3) In summer, people wear more light-colored clothes. This is because ____________________.

Be a good little judge.

(1) Black-colored objects absorb radiant heat quickly, while light-colored objects absorb radiant heat slowly. ( )

(2) The object is perpendicular to the light and absorbs more solar energy. ( )

(3) The larger the heating area of ​​an object, the less solar energy it absorbs. ( )

Keywords: Free download of Qingdao version of fourth grade science PPT courseware for the second volume, PPT download of Who is Hot Faster, .PPT format;

For more information about the PPT courseware "Who gets hot faster", please click on the "Who gets hot faster" ppt tag.

"Who gets hot faster" PPT:

"Who Heats Faster" PPT Part 1: The relationship between color and heat absorption 1. Wear gloves of different colors and feel the difference in temperature under the sun. 2. Use a thermometer to measure the temperature in a black and white Erlenmeyer flask placed in the sun. 3. Compare paper covers of different colors to absorb under the sun..

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Update Time: 2024-09-30

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