3.1 Source/Sustainability
There
are 5 main aspects in the Materials [7-12]
3.1.1. Human beings working with materials
- Human made things: making developed with more complex, making processes, more craft labour, greater amounts and types of material.
- Industrial revolution: decrease craft labour and increase in machinery.
3.1.2 Where materials come from
3.1.3 Ways of making
There
are 3 main types: Rock-stone-sand-cement-clay
·
Igneous: from molten magma cools and forms rock.
·
Sedimentary: Lay down as sediment, usually beneath the sea.
·
Metamorphic: changed by heat, pressure, or both, from the sedimentary and igneous rock.
3.1.4 Properties and qualities of materials
Principle
properties: strength, hardness, density, stiffness, ductility, conductivity, toughness, elasticity, malleability, plasticity, fusibility and durability.
Sustainability
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