Tube light is basically a fluorescent lamp that uses electricity to excite
mercury vapour present inside the tube light . Tube light is filled with
mercury vapour in low pressure along with argon or neon gas .
When the mercury vapour is excited , it results in the plasma formation
which produces short wave ultraviolet light . This causes the phosphor to
fluorescent the visible light .
This emission takes place in low pressure . Low pressure is such that it is
just 0.3% of atmospheric pressure . When the tube light breaks , these low
pressure gases are exposed to atmospheric pressure , thus come out with a
pop sound .
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