definition types properties advantages disadvantages uses to think about gabriela méndez gloria...
TRANSCRIPT
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•Definition
•Types
•Properties
•Advantages
•Disadvantages
•Uses
•To think about
Gabriela Méndez
Gloria Palacios
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•Definition
Wood is an organic material.It is produced as secondary xylem in the stems of woody plants, notably trees but also shrubs. The wood acts as a protective layer and gives hardness to stems
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•Types
. * Softwood: wood from conifers trees. (e.g. pine)
* Hardwood: wood from dicotyledons (usually broad-leaved trees, e.g. oak
These names are a bit misleading, as hardwoods are not necessarily hard, and softwoods are not necessarily soft
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There exist another kind clasification for wood types:
• Bitter: Its “taste” is less enjoyable to termites.
• Sweet: Wood wich is more sensitive to termite attack.
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•Properties
Physical Properties of wood:
-Wood is a bad conductor of heat and electricity.-Good Dimensional stability -Low Density -Resistance to weathering -Durability -Wood contains a small percentage of moisture.
Mechanical properties:
- Wood has good elasticitty- Big Strength
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•Advantages
*The wood is an excellent acoustic, thermal and electrical insulator.15 times more insulating than concrete 400 times more than iron and almost 2000 more than aluminium!!
*Is a tough material and has certain flexibility.It flexibility allows land movements or earthquake without cracking the structure.
*Wood is more resistant than steel or concrete because in a fire keeps it structure and load capacity.
*Low cost
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•Disadvantages*Moisture sensibility
*Wood is liable to fungus and bugs attack.
*Is requiered destroying a lot of forest worldwide to obtain low quantities of wood
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•Uses
-Fuel.
-Construction:
Houses and boats.
Roof construction, in interior doors and their frames, and as exterior cladding.
Shuttering material.
Raw material.
-Arts:
Sculptures and carvings.
Woodcut for engraves.
Musical instruments manufacture.
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People have used wood for millennia for many purposes, primarily as a fuel or as a construction material for
houses, tools, furniture, artworks and paper.
Wood continues to be used in a growing number of techniques and products but we must pay attention to the
world enviroment balance.
•To think about