Materials Around Us

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A material is any substance that is used to create an object. Examples: Paper (used to make books), Wood (used to make furniture), Metal (used to make utensils), Glass (used to make windows).

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Classification is the method of arranging objects into groups based on common properties. We classify materials to study them systematically, identify patterns, and understand their similarities and d

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Lustrous materials are those that have shiny surfaces when light falls on them. These are usually metals. Examples: Iron, Copper, Aluminium, Gold, Silver. Note: Some metals may lose their lustre due t

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Hard materials are difficult to compress or scratch (Examples: Stone, Iron, Wood). Soft materials can be compressed or scratched easily (Examples: Eraser, Sponge, Clay). Note: These properties are rel

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Transparent: Materials through which things can be seen clearly (Example: Clear glass, water). Translucent: Materials through which objects can be seen but not clearly (Example: Frosted glass, butter

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A material is soluble in water when it completely disappears or dissolves when mixed with water. Examples: Sugar and salt dissolve in water, so they are soluble. Sand and sawdust do not dissolve in wa

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Water is important for our body because it can dissolve a large number of materials. This property helps in digestion, transportation of nutrients, and removal of waste products from our body.

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Mass gives the quantity of matter in an object. The units to measure mass are gram (g) and kilogram (kg). Kilogram is the SI unit of mass. Example: A book has a mass of 200 g, a person has a mass of 5