why is aluminium used for making electric transmission wires ?
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because aluminium is a good conductor of heat and electricity.
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Aluminum is a relatively good conductor, lightweight, and fairly strong for its weight; it’s also relatively inert - a clean aluminum surface will get a very thin coat of oxide practically immediately upon being exposed to air, and then doesn’t corrode very quickly in most environments.
On the other hand, calcium is a very reactive metal - not quite as much as sodium, but it does react very quickly to air and especially to water (and in reacting with water, produces hydrogen gas), is not among the better conductors among the various metals, and is fairly soft and weak. Not a good choice for either wiring or a structural material.
Magnesium also reacts with water, although not as rapidly as calcium, and (especially when alloyed with aluminum) can be very strong, especially given its light weight. But there’s one little problem with magnesium - it is fairly easy to ignite (especially in powdered form), and burns with an intensely bright, hot flame. Not the sort of thing you want to be building with.
On the other hand, calcium is a very reactive metal - not quite as much as sodium, but it does react very quickly to air and especially to water (and in reacting with water, produces hydrogen gas), is not among the better conductors among the various metals, and is fairly soft and weak. Not a good choice for either wiring or a structural material.
Magnesium also reacts with water, although not as rapidly as calcium, and (especially when alloyed with aluminum) can be very strong, especially given its light weight. But there’s one little problem with magnesium - it is fairly easy to ignite (especially in powdered form), and burns with an intensely bright, hot flame. Not the sort of thing you want to be building with.
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