> bulb with water still working

Bulbs are not 'filled' with vacuum, but with a mixture of non-active
gases, among them Argon and Nitrogen, at low (but not vacuum) pressure. As
long as there is no Oxygen in the bulb the filament will continue to work,
but the heat losses will become enormous so it will be much dimmer. This
is not true for very small bulbs which are indeed vacummed.

Peter

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