A coil, in chemistry, is a tube, frequently in spiral form, used commonly to cool steam originating from a distillation and thus to condense it in liquid form.
Usually it is of copper or another material that conducts heat easily.
However copper is mostly used as a material, when a higher hardness is required it is combined with other elements to make an alloy such as brass or bronze.
[1] Coils are often used in chemical processes in batch reaction or mixing tank as internal source of heat transfer.
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