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R AW MATERIALS:
ARE MATERIALS TAKEN FROM NATURE.
Animal:wool
Plant:cotton
Mineral: marble
REFINE RAW MATERIALS TO OBTAIN NATURAL MATERIALS.
PROCESS RAW MATERIALS,THEY BECOME PROCESSED MATERIALS [we obtain products]
TO CONSTRUCT AN OBJECT IS  CALLED A TECHNICAL MATERIAL.

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ANIMAL   PLANT   MINERAL
WOOL       LINEN    SAND
CORK     CLAY
SILK        MARBLE

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plastic from crude oil
metal and glass from rocks
flour from wheat
tree trunk from wood
bedside table
cow-milk-chesse

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NATURAL         PROCESSES  n SILK STEEL
CORK                         LATEX
SLATE                        BRASS

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EACH MATERIAL HAS CERTAIN CHARACTERISTICS OR PROPERTIES THAT MAKE IT SUITED TO A CERTAIN USE

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SHOES WITH-LEATHER-SKIN
PARTITION WALL WITH-WOOD
STREETLIGHT WITH-ENERGY-LIGHT BULB
STAY CABLES WITH-STEEL

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UMBRELLA: PLASTIC-CLOTH
CHAIR:WOOD-PLASTIC-CARBON FIBER
FRYING PAN:STEEL

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CAR HEADLIGHT:LIGHT BULB
MATTRESS:COTTON,FEATHERS
GOLF CLUB: STEEL

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CHAIR OF WOOD,ADVANTAGES:IS MORE STRONG AND RESISTANT.
DISADVANTAGES:IT BURN VERY EARLY.

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NATURAL ELEMENTS: cork, pine,plywood,ebony,beech,fir.
MAN-MADE ELEMENTS: ash,chipboard,cardboard,lime.

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WOOD HAVE SEVERAL PROPERTIES THAT ARE UNDESIRABLE IN THE TECHNICAL APPLICATIONS:
COMBUSTION:advantage - must apply flame reterdant paint,disadvantage:wood burns easly.
MOIDTURE:advantage-the lower the humidity,the less decay and the wood will last loger,disadvantage:wood absorb moisture and this causes it to dilate.
ROTTING AND INSECT ATTACK:advantage-we can varnish the  wood to stop this form happened,disadvantage-wood can also be attacked by insects,which lay eggs and then they lerve feed on it.

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copper:is the moste electrical conductive.We use to do some money.
tin:is a quimic element.
aluminium:is a chemical element.
zinc:is a the primary component of the hot.did.

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IRON:is a chemical element.It is metal in the first transitions series.
STEEL:is an alloy of iron  and carbon and other elements .
CAST IRON:can be readily cast in a mould.

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-PLATES: the thinner ones are called sheets.
-SECTIONS:square,circle,triangle.
INGOTS:blocks obtained by pouring liquid metal into a mould

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Tensile strenght (resistance to streching) : it is good in the longitudinal direction (the direction of the grain) and poor  tranverse direction.
Compressive strenght ( resistane to being crushed : it is the better in the tranverse direction than in the lungitudinalian direction.
Flexural strenght (resistance to bending : this is why it was used a lot in the past to make posts and beams...EX   elm pinem ...
hardness: it depends of the type of wood,the structure and the cutting direction.Wood is not hard and this make it esier to work with.
thoughness: it is used in sports equipment like hockay sticks baseball bats...
thermal and electrical conductivity : it is very low.This is why wood is used to make handles and tools.
sound conductivity:used to make certain musical instruments.
colour:diferents woods have different colours: withe,yellow,dark yellow,brown,red,black,etc.
density:this is why it is used to builds ships.

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METALS THAT CONTAIN MAINLY IRON ARE CALLED FERROUS METALS.METALS THAT DO NOT HAVE IRON IN THEIR COMPOSITION ARE CALLED NON FERREUS METALS.
ferrous metals:iron,steel,cast iron.
non-ferrous metals:copper,tin,aluminium,zinc

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MAN-MADE WOODS
-Table-tennis paddles
-boats
-Kitchen cabinates
WOOD DERIVATIBES
-NEWSPAPER
-BOXES
-INSULATIONS

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MECHANICAL PROPERTIES:hard,malleable,ductile,tough.
THERMAL PROPERTIES:good conductors,expand when the temperatures contract when it falls,can easily be soldered.
ELECTRICAL AND MAGNETIC PROPERTIES: good conductors of electric current, magnetic  behaviour.
OTHER PROPERTIES: rust conductors,solid,heavy.