Epic2112@lemmy.world to No Stupid Questions@lemmy.world · 1 year ago

If incandescent lightbulbs have a vacuum inside, why do they get so hot on the outside?

Epic2112@lemmy.world to No Stupid Questions@lemmy.world · 1 year ago

Shouldn’t the vacuum insulate the glass from the heat of the burning filament?

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FiskFisk33@lemmy.world
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1 year ago
Vacuum means no convection heat. It however does not mean no radiation heat. The filament radiates heat through vacuum the same way the sun does.

Additionally, theres not vacuum in buldbs, but inert gas, like argon.

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