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Fluorescent bulbs contain small amounts of mercury, in common four-foot tubes it normally contains between 2 and 5 milligrams. When subjected to an electrical field, mercury generates ultraviolet radiation that is converted to light. When broken, mercury vapors may be released into t

Compact and tubular fluorescent bulbs contain hazardous metal mercury. Metallic mercury at room temperature is in a liquid form that can easily evaporate from liquid to a vapor. Mercury vapor is colorless and odorless. Fluorescent bulbs contain mainly mercury vapor, but fluorescent bu