"Thermal Expansion and Contraction of Metal" Thermal PPT Courseware 3

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"Thermal Expansion and Contraction of Metal" Thermal PPT Courseware 3

Activity 1: What methods can you use to verify whether metal expands with heat and contracts with cold?

Experimental materials: metal balls, metal rings, alcohol lamps, matches, cold water

Experimental illustration:

Pay attention to safety when doing experiments!

1. When lighting an alcohol lamp, you must use a burning match. Never use a burning alcohol lamp against the fire.

2. When heating is completed or alcohol needs to be added to extinguish the lamp flame, the lamp cap can be used to extinguish it. After the lamp cap is extinguished, it must be re-capped. Never blow it out with your mouth.

3. It is forbidden to touch the copper balls. The heated copper balls will burn the skin.

Do solids expand with heat and shrink with cold?

1. Heating the metal ball, the metal ball cannot ______ pass through the metal ring. Explain that when the temperature of a metal increases _____, its volume increases _____.

2. After immersing the metal ball in the cold water in the beaker, the metal ball _____ can pass through the metal ring. Explain that when the temperature of a metal decreases _____, its volume becomes smaller _____.

Summary: Solids also expand with heat and shrink with cold.

knowledge application

1. When the can cannot be opened, how can you open the lid of the can?

2. Why are the wires between two telephone poles tight in winter and loose in summer?

There are many phenomena of thermal expansion and contraction in life.

1. There is a gap between the telescopic bridges

2. There are gaps between cement slabs and pavement, etc.

3. The bottle cap cannot be unscrewed. Use hot water to scald the bottle cap to unscrew it.

Think back: What knowledge have you learned in these lessons?

Liquid (water) has the property of expansion with heat and contraction with cold

Gas (air) has the property of expansion with heat and contraction with cold

Thermal expansion and contraction of solid metals (copper and steel)

Many objects have the property of thermal expansion and contraction

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For more information about the PPT courseware "Thermal Expansion and Contraction of Hot Metals", please click on the "Thermal Expansion and Contraction of Hot Metals" PPT tab.

"Thermal Expansion and Contraction of Metals" Thermal PPT Courseware 2:

"Thermal Expansion and Contraction of Metals" Hot PPT Courseware 2 In 1825, the first railway was laid in the UK. The rails were welded together one by one. As a result, in the hot summer, the rails became twisted, bent left and right, and even arched upward in some places.

"Thermal Expansion and Contraction of Metals" thermal PPT courseware:

"Thermal Expansion and Contraction of Metals" Hot PPT Courseware In 1825, the first railway was laid in the UK. The rails were welded together one by one. As a result, in the hot summer, the rails became crooked and even arched upward in some places, and in the cold winter...

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Update Time: 2024-06-25

This template belongs to science courseware Fifth Grade Science Volume 2, Textbook Edition industry PPT template

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