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Welcome to My Presentation Submitted By Ganga C.A Physical Science10/10/2015For internal use onlyTopic - Metals (physical properties of metals)10/10/2015For internal use only METALS10/10/2015The study of metals in a direct view of the history of mankind, its culture and growth

The discovery of metals and their use had minimized the work load of man and revolutionary changes occurred in agriculture and industry through production of new equipments.

The metals such as iron, copper aluminum gold and silver are used in day to day life

Some of them are occurred as compounds and others are occurred as free in our nature.

For internal use only3Common Metals 10/10/2015MetalsUsesIron (Fe)Machines, bars, making steelsRods, wires, utensils, furnitureAluminum(Al)Antennas, roofs, reflectorsOrnaments, crackers, packing foilsMaking alloys such as duralumin, magnalliumGold(Au)Ornaments, Gold plating (electroplating)Silver(Ag)Ornaments , Electronic circuitsElectroplating, conductors, UtensilsCopper(Cu)Electronic circuits, roofsManufacturing alloys such as brassZinc(Zn)Dry cell, For galvanizingManufacturing alloys - brass, gun metailChromium(Cr)For galvanizingManufacturing alloys - stainless steel, chrome steelNickel(Ni)Manufacturing alloys - stainless steel, alnicoNickel plating, tinsheetTin(Sn)Manufacturing alloys like solder, tin platingLead(Pb)Making storage cells, metal balls in fishing netsFor internal use only4General characteristics 10/10/2015Hardness Most of metals are hard metal, how ever there are quite few metals which are soft Lithium, sodium and potassium are soft metals

Iron, aluminum, copper etc are hard metals

Electrical conductivityMetals are conductors of electricity. The ability of a substance to let electricity pass through is known as electrical conductivity

Silver is the best electrical conductor among metalsCopper ,aluminum are also good conductors of electricity

For internal use only5General characteristics 10/10/2015Thermal Conductivity Metals are thermal conductors and they have high metallic points. The ability to conduct heat is an important property of metals . This property is known as thermal conductivity. silver is the best thermal conductor among metals Aluminum, copper etc also posses comparatively high thermal conductivity

Because of the high metallic point and the thermal conductivity, metallic vessels are used for cooking.

Metallic lustreThe surface newly formed when metals are cut , has a shining appearance. This property of metals are called metallic lustre.All metals have not equal shiny appearance

For internal use only6General characteristics 10/10/2015Malleability Metals can be heated into thin sheets by hammering . This property is known as malleability. gold is the best malleable metalOne gram of gold can be heated into sheets within are of 6.7 square feet and can be drawn into a wire of about 2 km in length Aluminum has also a high malleability. By using the malleability of aluminum, aluminum foil is used to wrap chocolate and sweets

DuctilityMetals can be drawn into thin fine wires. This property is known as ductility.Platinum is most ductile metalThe filaments of electric bulbs are made of tungsten. Tungsten can be Drawn into fine wires . Hence it is used to make filament

For internal use only7General characteristics 10/10/2015Sonority The ability of metals to make sound when tapped with a hard material is known as sonority. Metals are used to make instruments like cymbals and bellsbecause they produce sound when hit with an object

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