why temp hotter at top?

[Guest sheikhfahad]

CAn you tell me why will the temperature of the surface will be hotter at the top on the blub rathen than on the side?

thank you

[Cap'n Refsmmat]

Heat rises.

[Sayonara]

No it doesn't - hot fluids rise.

 

Well actually to be uber pedantic, fluids of higher density sink through fluids of lower density.

[Guest sheikhfahad]

No it doesn't - hot fluids rise.

 

Well actually to be uber pedantic' date=' fluids of higher density sink through fluids of lower density.[/quote']

 

can u tell me more what is hot fluid in the bulb inside, aint it vacum isnide.

[Dave]

No, argon is usually used inside a bulb to stop the filament from oxidizing (I think?)

[Sayonara]

What do you mean by the "top" of the bulb?

[Guest sheikhfahad]

What do you mean by the "top" of the bulb?

You the top, when u leave the bulb on for long the area where it goes black, top surface.

[Cap'n Refsmmat]

The tip.

 

Still, basically, heat rises (through your fluid). It's convection (sort of).

 

I think they do use argon, or sometimes other inert gases. Otherwise the heat could only be transferred through radiation, and radiation doesn't rise.