Good question! Well, remember that things glow
when they get hot, and the hotter they are, the
brighter they glow. So for example, a red-hot
piece of metal is not as hot as a white-hot piece
But there's a limit to hot how something can
get before it melts, and that puts a limit on how
brightly it can glow without melting. Tungsten
is used in light bulbs because it has a very high
melting point: it melts at 3,422 degrees Celsius!
Nichrome, on the other hand, melts at 1,400
degrees Celsius. So it's not that tungsten
glows brighter than nichrome; it's that you can
heat up tungsten to a much higher temperature than
nichrome without it melting, so it can glow
brighter without melting.
Hope that helps!
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