content page message from us discovery of metal & wood properties of wood properties of metal...
TRANSCRIPT
Content Page• Message from us • Discovery of metal & wood• Properties of wood• Properties of metal• Uses of wood in past & present• Uses of metal in past & present• Last messageCredits to:CALEB,RYAN YEO,NIGEL,NICOLE&ZHONG HAN
FROM:THE YOUNG SCIENTIST
Message from us
• We will be presenting metal and wood . So open your eyes & ears to see & listen to our facts!(unless you forgot to bring them)
• We will be presenting metal and wood . So open your eyes & ears to see & listen to our facts!(unless you forgot to bring them)
wood metal
Discovery of materials
WoodNo idea of when ,who& how
it was discovered.Man first used it when he
picked it up.
MetalProbably discovered by
accidentGold-6000bcCopper-4200bcSliver-4000bcLead-3500bcTin-1750bcIron-1500bcMercury-750bcRhodium-1803-1804
Properties of wood
• Strong • Quite soft• Non-waterproof• Not bendable• Float on water• Bad conductor of heat• Bad conductor of electricity• Non-flexible
Properties of metal
• Excellent conductor of heat
• Non-flexible
• Sink in water
• Hard
• Strong
• Waterproof
• Solid at room temperature(except mercury)
• High melting point
• Malleable
• Excellent conductor of heat(for some metals)
• Bendable when heated
• Not easily broken
USES of WOOD in PAST & PRESENT
PASTSome of the earliest uses of
wood were fuel for heating &cooking.Even today,this accounts the highest demand & use of wood in many developing countries.As industrial technology advances, wood was more frequently in exterior structural applications.Wood was also used to make boats & spears.
PRESENT• To make furniture• To make the first out-line
shape of buildings• To make fences• To make spoons,
chopsticks& toothpicks• To make paper• To make flooring• To make wood chips for
decorations• To produce heat• To make bamboo sticks for
hanging clothes
Uses of metal in past and present
PAST• To make coins• To make weapons• To make jewelry• To make tools• To make armor• To make combs• To make art• To beautify• To make decorations• To construct things
PRESENT• Make machines /jewelry
/musical instrument• Connectors of electrical cables
like audio,video & USB cables• Dental fillings(sliver&mercury• Manufacture of
computers/communication equipment/jet aircraft engines/spark plugs
• Steel for construction of buildings
• Watch making• Photography
LAST MESSAGEThank you for your attention
SOURCEShttp://www.purpleslinky.com/Trivia/Science/Five-Most-Precious-Metals-and-Their-Amazing-Uses.149553/2
http://goliath.ecnext.com/coms/gi 0199-1167354/Past-present-future-of.html
http://neons.mems.cmu-edu/cramb/Processing/history.html
http:en.wikipedia.org/wiki/Wood
http:en.wikipedia.org/wiki/Metal