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1º TECHNO UNIT 4 s1

4. Materials

TermDefinition
Raw materials Are substances that are extracted directly from natural objects
Materials Are the result of transforming raw materials by physical and chemical processes
Manufactured goods Objects created by humans to satisfy their needs ans improve their standard of living
Physical properties Properties relate to how materials react to external stimuli
Electrical properties How a material behaves when an electric current pass through it
Electrical conductor Materials that allow an electric current to pass through them
Electrical insulator Materials that don´t allow an electric current to pass through them
Thermal properties How a material behaves when heat pass through it
Thermal conductor Materials that allow heat to pass through them
Thermal insulator Materials that don´t allow heat to pass through them
Expansion and contraction The material increases it size when temperature is increased and reduces it size when temperature is decreased
Fusibility The capacity of changing from solid to liquid when the temperature is increased.
Weld Join pieces together by using heat or chemicals
Acoustic properties How a material behaves when sound tries to pass through it
Acoustic conductor Materials that allow sound to pass through them
Acoustic insulator Materials that don't allow sound to pass through them
Magnetic properties How a material behaves when a magnet is near it
Magnetism Materials that attract other metallic materials
Optical properties How a material behaves when light pass through it
Opaque Materials that don't allow light to pass through them
Transparent Materials that allow light to pass through them, and objects behind them can be clearly seen
Translucent Materials that allow light to pass through them, but objects behind them can't be clearly seen
Mechanical properties How a material behave when external forces are applied
Mechanical strength How a material behaves when a force acts upon it
Elastic Materials that return to their original forms after a force that has changed their shapes is removed
Plastic Materials that remain permanently deformed after a force has changed their shapes
Malleable Materials that can be spread into sheets or films
Ductile Materials that can be formed into filaments
Hard Materials that can't be easily scratched
Tough Materials that can't be easily broken
Brittleness Property of materials that can be easily broken
Density Relation between the mass of an object and its volume
Porosity Property of some materials that can absorve or release liquids or gases
Permeable Materials that allow water to pass through them
Impermeable Materials that don't allow water to pass through them
Chemical properties Properties that we can see when the chemical composition of a material changes becausse it interacts with other substances
Oxidation what happens when a mineral reacts with oxygen in the air or water
Ecological properties Properties related with the impact that a material causes on the environment
Recyclable Materials that can be reused
Toxic Harmful materials
Biodegradable Materials that decompose naturally
Renewable materials Materials that can be regenerated
Created by: amediavilla
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