Topics in Basic TechnologyType of Lines in Technical Drawings Len Academy questions for Basic Technology, JSS2, 2nd Term Len Academy questions for Basic Technology JSS2, 2nd Term, Part 2 Maintenance, Types of Maintenance Wood, Characteristics of Hardwood and Softwood Ceramics, Types and Properties
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They say money do not grow on trees but interestingly, wood does, and they make up the trunks and branches. A wood is an organic material and a structural tissue composed mainly of cellulose, making up the stem, roots and branches of trees. The outermost skin or covering of the wood is called the bark. On peeling off the bark, next you will see the sapwood which contains the plant's transport system called the xylem. Also seen inside the sapwood is the heartwood, but here, the xylem is blocked with gums and does not function. The cambium is seen around the edge of the sapwood.
Wood can be put into two types. They are
Note: Woods are porous and fibrous and the term (hardwood and softwood) don't always refer to the wood's actual hardness or softness.
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Hardwoods are always derived from angiosperms with broad leaves. (angiosperms are flowering plants that produce seeds encased in fruits or pods). Most times, hardwood are stronger than softwood but there are exceptions. For instance, Balsa is a hardwood that is actually soft. Hardwood has the following characteristics:
Examples of hardwood include hickory, ash, beech, alder, teak, birch, mahogany, maple, oak, balsa and walnut.
Image Credit: Narangba Timbers
Softwoods are often derived from coniferous trees, that is, trees with needle-like leaves and whose seeds are covered in cones. These trees are classified under gymnosperms. Softwood trees are very tall and straight. They possess the following characteristics:
Examples of softwood include cedar, larch, juniper, yew, cypress, fir, pine, spruce, douglas fir and redwood.
Amazing facts in Basic Technology
Volkswagen group of companies own some of the top cars of the world. These are Audi, Bentley, Bugatti, Ducati, Lamborghini and Porsche
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