Examples of non-lustrous materials include paper, wood, rubber, and jute, which do not have shiny surfaces. NCERT Science Textbook Curiosity Science Session 2024-2025.
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Some metals lose their lustre due to the effect of air and moisture, which can cause oxidation or tarnishing, making them appear dull or non-lustrous. NCERT Book Curiosity Science Class 6 Class 6 Science NCERT Chapter 6.
A lustrous appearance means the material has a shiny surface that reflects light, which is a characteristic commonly found in metals. Class VI NCERT Book Curiosity Science Session 2024-2025.
Grouping materials based on appearance helps in understanding their properties and potential uses, as well as identifying similarities and differences among various materials. NCERT Book Curiosity Science Class 6 Chapter 6 Materials around us Class 6
Metals like iron, copper, and aluminium might be grouped together because they often share properties like shine, hardness, and conductivity, which make them different from non-metals like wood or paper. NCERT Book Curiosity Science Class 6 Chapter 6 Materials around ...