必应词典为您提供Metal-is-a-good-conductor-of-electricity的释义,网络释义: 金属是很好的导电体;金属是电的良导体;
“Although lead compounds can be good insulators, pure lead is a metal that conducts electricity, making it a poor insulator. Lead’s resistivity is 22 billionths of a meter. It sees use in electrical contacts because, being a relatively soft metal, it deforms easily when tightened and makes...
Where the solution is a relatively poor conductor of electricity the corrosion is likely to be more localised. The geometry of the system and in particular the relative properties of the dissimilar metals in contact will also affect the intensity of corrosion in particular locations. The situation ...
process for assembling a metal conductor of electricity with an element is a substance is obtained by this process and assembly of refractoryTITUS,LESLIE
the shape desired, as it is not hard and is very ductile. Thus, thin wire and very thin foil, like gold-leaf and silver-leaf, can be made; the latter is greatly used for " silvering," since sulphurous gases do not blacken it. Aluminium is a good conductor for heat and electricity....
at room temperature is not as high as in metals, thus cannot conduct current as good as metal. Theelectrical conductivity of semiconductoris not as high as metal but also not as poor as electrical insulator. That is why, this type of material is called semiconductor – means half conductor....
Copper is a chemical element, a reddish, extremely ductile (able to be drawn out into a thin wire) metal. It is an excellent conductor of electricity and heat. Where does copper come from? Copper is found in the free metallic state in nature. First used in 8000 BCE, it was a substitu...
The oxides of active metals can be dissolved in water to form alkali, such as Na2O + H2O = 2NaOH, the metal oxides with poor activity are insoluble in water, but most of them are soluble in acid: CuO + H2SO4 = CuSO4 + H2O, some metal oxides come from mineral ...
Metals are elements that are lustrous, solid, opaque and high in density. The boiling and melting points of metals are very high. Also, they are the effective conductors of electricity and heat. They are ductile (can be drawn into thin wires) and malleable (beaten in thin sheets). As the...
Metal elements are typically shiny, malleable, and good conductors of electricity, while nonmetals are generally dull, brittle, and poor conductors.