What is the material used in florescent tube?

What is the material used in florescent tube?
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Answer :

The fluorescent tube is filled with argon gas at law pressure and some mercury after evacuating the tube. This argon gas gives initial starting at quick manner. Initially the mercury is in the form of globules on the inside of the tube surface. As the temperature increases the liquid takes globules mercury changes into vapour form and takes over the conduction of the current.
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