A wick is required when a fuel in melted/liquid form is being used. The melted/liquid fuel rises through the wick and form vapours which then burn to give flame.
Example: Candle burns with the help of a wick in which molten wax rises through the wick and form vapours which then burn into flame.
So we can conclude that a wick is required in cases when fuel is not present in vapour form. But in case of gas burners, gas is used as fuel which has low ignition temperature and can be burnt directly without the help of wick. Therefore a wick is not used in gas burners.
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