"New Materials and Their Applications" Scale, Mass and Density of the Material World PPT Courseware 3

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"New Materials and Their Applications" Scale, Mass and Density of the Material World PPT Courseware 3

Self-learning

1. Nano is the unit of what physical quantity?

2. What are nanomaterials?

3． Give some examples of the miraculous effects of nanomaterials?

4. What are “green energy”? What are the benefits of using “green energy”?

5. What are the main components of memory alloy?

6. What are the unique physical properties of memory alloys?

1. Nanomaterials

1nm=10-9 m

When the scale of certain substances is processed to 1 to 100 nm, their physical or chemical properties undergo abnormal changes compared with those at larger scales, and they have some special uses. This kind of material is called nanomaterials.

A scholar gave us some figures: According to internationally accepted energy forecasts, oil will be exhausted in 40 years, natural gas will be used up in 60 years, and coal can only be used for 220 years.

People around the world have realized that uncontrolled energy consumption will lead to further deterioration of the earth's environmental conditions and damage to human lifestyles. Now, countries around the world are actively developing various new energy sources, especially renewable "green energy".

2. “Green Energy”

1. Lithium battery: small in size, light in weight, can be recharged multiple times, and causes little environmental pollution;

2. Silicon photovoltaic cells: Convert solar energy into electrical energy without causing any pollution to the environment;

3. Hydrogen fuel: no pollution, no noise, high efficiency

Three: Memory alloy

1. The main components of memory alloy are ______ and ______.

2. Physical properties of memory alloy: When the temperature of the object reaches a certain value, the crystal structure inside the material will change, resulting in a change in appearance.

practise

1. Among the following various energy sources, which one belongs to "green energy" ( )

A.Solar energy B.Coal

C. Oil D. Natural gas

2. Regarding "green" energy and memory alloys, the correct understanding is ( )

A. The so-called "green" energy refers to energy that is green in color, such as lithium batteries with green wrapping paper.

B． Silicon photovoltaics are superior to lithium batteries and absolutely pollution-free.

C. Memory alloy is a special metal that has memory and can remember its original shape.

D. Generally, metals can be combined to form memory alloys.

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"New Materials and Their Applications" Scale, Mass and Density of the Material World PPT Courseware 2:

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Update Time: 2024-07-30

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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