The spiral shape from the CFLs show how machines specifically designed to spin glass. Once the bulb is cool, the air is vacuumed out, and small amounts of mercury gas are added. The spiral shape of these bulbs was built out of necessity. The flourescent bulbs produce light only from their phosphorus coating, there needs to be a certain amount of surface area available for this coating. The spiraling tube provides the maximum amount of surface space in the smallest total area, which allows the bulb to produce sufficient lighting for most applications.
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