Different kinds of materials:
- Metals are shiny (lustrous) in appearance.
- Metals are flexible, so they can be bent.
- Metals are good conductors of heat and electricity.
- Metals are hard and strong.
- Metals can be heated to high temperature.
- Metals are malleable. So they can be beaten into thin sheets.
- Metals are ductile. So, they can be drawn into wires.
- Metals are used to make kitchen utensils, cutlery, containers and jewellery.
- Wires drawn from metal are used in cables for electrical fittings in our houses.
- Maximum use of metal is in tools and machines.
- Magnets made from certain metals are used in toys and machines.
- Glass is shiny, smooth and hard.
- Glass is hard but heated glass can be moulded to any shape.
- It is non-flexible and brittle.
- Glass can be powdered when crushed.
- Glass is conductor of heat.
- Glass is non-conductor of electricity.
- We can see though a glass.
- We can see into a glass mirror. Mirror reflects the light.
Uses: Glass is used to make door and windowpanes, table tops, mirrors, storage bottles, science apparatus, electric bulbs.
- Ceramic is made from dried clay and is polished or glazed.
- Ceramic is shiny and smooth.
- It is hard and brittle.
- Ceramic is good conductor of heat.
- It is poor conductor of electricity.
- We cannot see through ceramic.
Uses: Ceramic is used to make crockery. It can also be used as an electrical insulator. It is highly used for floor and wall tiles. Decorative vases are made from ceramics.
- Plastic is flexible.
- Plastic is bad conductor of electricity.
- Plastic melts on heating. It catches fire.
- Plastic can be moulded into various shapes.
- Light may pass through some plastics.
- They are transparent or translucent.
Uses: Plastic is most widely used for making kitchenware, electrical pin-plugs, baskets and carry bags, buttons for shirts and suiting. It is also used for making chairs and stools.
- Fibre is soft ang light in weight.
- Fibre is strong enough to hold together.
- Fibre is poor conductor of heat and electricity.
- Fibre is flexible can be spun into threads and woven into fabrics.
- Fibre catches fire easily.
Uses: Fibre is used for making clothing material and garments, sheets and curtains. It is used in wipers, especially cotton is used for cleaning floors.