why is it important that metal leads & the glass have the same coefficents of expansion?
924992
If they expand unevenly, small gaps will develop between them. This will allow air in, which will oxidize the filament, and the life of the filament in the bulb will be shortened.
1131804
You have the potential for galvanic corrosion.  Essentially, two metals at different potentials share electrons and one metal (the one with the higher potential) will start to erode and "plate" the other metal.\n\nTypically, using some sort of material that is a non-conductor (ceramics, rubber, etc) between the two or passivating the metal surfaces or coating the metal surfaces (prime and paint per ANSI standards) are your best options to prevent this.
405523
If the spheres are of same volume, their apparent loss of mass will be the same.\n\nIf the spheres are of same mass, Aluminium sphere's apparent loss of mass will be more.
660491
its makes for versatile application of the particular element..for instance graphite allotrope of carbon can be used for pencil lead
106147
It is just from the way that the elements are fused together to form the compound. It's the same as any other metal.
1011938
Resistance does not depend upon the ductility of the metal used in the wire.\nDuctility is the property of the substance to be easily drawn into wires.  This does not effect electrical resistance.
983144
interior of cup expands faster than exterior of cup due to poor thermal conductivity of the cup material.\n\nglasses that are thin enough will not suffer this problem because heat can conduct thru thin materials easily so that thermal expansion is more or less equal on the interior and exterior.\n\nyou can also force one of your glasses to break by cooling the glass with ice water, dumping the ice water away and then dousing the glass with boiling water. try not to hurt yourself.\n\nbicycle tire ruptures due to a simpler explanation. the tire cannot withstand increased pressures that occur when a gas is heated in a closed system. (gay-lussac law)
415462
Several lead alloys are widely used. Solder, an alloy that is nearly half lead and half tin, is a material with a relatively low melting point that is used to join electrical components, pipes and other metallic items. Type metal, an alloy of lead, tin and antimony, is a material used to make the type used in printing presses and plates. Babbit metal, another lead alloy, is used to reduce friction in bearings.
43501
Its a Metal, hence responds to / is a conductor of heat.\n\nIts fluid so the expansion per gradient of heat would be highest.\n\n\nAll other liquids are not a conductor of heat ( or as good as mercury)
962196
It's depends the way you formulate the composition of plastics.These days ABA/ABS is similar to metals and glass.Some composition of polyurethane are also like metals and as transparent as like Glass.Say for example Bakelite which we used in electrical fuses and switches which replace metal as well as providing us security of electrical shocks.
975863
Connection? or disconnection...\n\nSemiconductors are not metals - nor do they intend to be.
709208
You can find international suppliers at the reference.  It appears that many materials are used including plastic and aluminum.
646721
It was believed that if the mug is thicker, it will hold hotter liquids and so mugs were thicker then. This is not true because being thicker, the inner wall of the mug will expand much faster than the outer wall. This results in the mug cracking.\n\nNowadays, mugs and glasses have thinner walls. This results in the inner and outer walls expanding at rates that are closer and so the material will not crack.
144979
metal expands when heated...hence the lid will become wider and easier to open...
623497
Glass and SiO2 are chemically same. But the glass is sytematic arrangement of atomic structure and can happen as a slow physical process
293478
both will have a miniscus and this is due to the adhesive property of water. the cohesive property keeps the water molecules togherter but the adhesive props allow for movement as in a cappilary tube. the gLass is clearer than the plastic so im thinking glass
987176
I can't say for certain, but I assume the length of the gaps does not increase.  The length of the tubes increase so that the time it takes to traverse the tube stays the same.  I think the only constraint on the gaps is how close the tubes can be to each other.  You'd want it to be as small as possible to get as much accelleration as possible.