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Presentation of the properties of materials, one of the contents of Technology 2nd ESO.

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  1. 1. Properties of Materials AICLE Unit – Materials & Tools Technology 2nd ESO Javier Guerra Jiménez
  2. 2. Material Properties  How can we choose what material should we use?  Physical Properties  Chemical Properties  Ecological Properties
  3. 3. Physical Properties  How they react to external stimuli?  Physical Properties:  Electrical  Thermal  Acoustic  Magnetic  Optical  Mechanical  Other properties
  4. 4. Electrical Properties  We can distinguish between:  Electrical conductivity: metals.  Electrical insulation: plastic, wood, stone, ceramics
  5. 5. Thermal Properties  How do materials behave when heated?  Thermal conductors: metals  Thermal insulators: wood and plastic  Fusibility: Metals, some plastics and glass.  Welding: Metals, e.g. Tin.
  6. 6. Thermal Properties
  7. 7. Thermal Properties
  8. 8. Thermal Properties
  9. 9. Acoustic Properties  Can you hear sound through a material?  Acoustic conductors.  Acoustic insulators: glass, cork & plastics
  10. 10. Magnetic Properties  Does a magnet attract the material?  Magnetism: Ferrous metals (steel).
  11. 11. Optical Properties  Can you see light through a material?  Opaque: Light don’t pass. Wood & Metals.  Translucent: Light passes, but we cannot see objects behind them clearly. Some types of glass and plastic.  Transparent: We can see perfectly through them: Glass and some plastics.
  12. 12. Optical Properties Opaque Translucent Transparent
  13. 13. Mechanical Properties  Mechanical Strength. How the material resists the action of forces.  Elasticity. The material returns to its original form after a force that has changed its shape is removed.  Plasticity. The material is permanently deformed after a force is applied.  Malleability: Allows a material to be spread into sheets or films.  Ductility: Allows a material to be formed into filaments or wires
  14. 14. Other Physical Properties  Density. Relation between mass of an object and its volume.  Permeability: Allows water or other liquids to filter through them.  Impermeability: Doesn’t allow water or other liquids to filter through them.
  15. 15. Chemical Properties  When the chemical composition of a material changes because it interacts with other substances.  Oxidation. The material reacts with the oxygen in the air or water. This happens with metals, producing rust.
  16. 16. Ecological Properties  Recyclable materials. They can be reused (Glass, paper, cardboard, metal, plastics).  Toxic materials. Harmful and sometimes poisonous (Mercury, heavy metals, petroleum).  Biodegradable materials. They decompose naturally and don’t damage the environment (paper, bioplastics,…)
  17. 17. Thank you very much for your attention!