nichrome wire?

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Nichrome wire 中文是镍铬线或镍铬合金线，成份是镍与铬的合金。 在焰色试验中，气态的金属离子在蓝焰中吸热，把最外层电子升上较高能级。当这些电子降回基态时，会放出电磁波，某些金属所放出的电磁波是特定的可见光线，产生特定的焰色。因此，我们可以凭焰色来鉴定金属离子。 In flame test
when the vapour of metal ion absorbs heat in blue flame
its electrons in the outermost shell will promote to higher energy levels. When such electrons go back to ground state
they give off electromagic wave. The magic wave released from some certain metal ions are visible light with characteristic colour. Therefore
we can identify such metal ions by their flame colours. 但金属化合物的气化温度有高有低。若把镍铬线蘸以浓氢氯酸与所测试的金属化合物，金属离子会与氢氯酸中的氯离子，以金属氯化物的形式气化。这因为金属氯化物的气化温度较低。 Different metal pounds have different temperatures for vapourization. When the nichrome wire is dipped in concentrated hydrochloric acid and then stick a little powder of the metal pound
the metal ions will vapourize in the form of metal chloride with the chloride ion in the concentrated hydrochloric acid. This is because metal chlorides have the lowest temperatures for vaporization among all metal pounds.