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0.00273 megatonnes is about 80,000,000 times as heavy as a Light Bulb
In other words, the weight of a Light Bulb is 0.0000000130 times that amount.
(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 0.0000000000340 megatonnes. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
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