Lustre refers to the way light reflects off the surface of a material, giving it a shiny appearance. Materials with a high lustre, like metals (e.g., gold or silver), look shiny and glossy. On the other hand, materials with low ...

An example of classification based on hardness is the division of materials into hard and soft categories. For example, diamond is a very hard material, often used in cutting tools, while rubber is a soft material, used for making flexible ...

A material is a substance or matter used to make objects or things. It can be natural or man-made and comes in various forms such as solids, liquids, or gases. For example, wood, metal, and plastic are materials used to ...

Opaque materials are those that do not allow light to pass through. When light hits these materials, it gets blocked or absorbed. Examples of opaque materials include wood, stone, and metal. For instance, you cannot see through a wooden door ...