Tungsten filament candle light bulbs, with bayonet cap bases. The sealed glass bulbs encase a metal filament under an inert gas, usually an argon-nitrogen mixture. Electric current flows through the tungsten filament (melting point of 3410 degrees Celsius), which heats up and glows. The coloured glass used in these bulbs are green, orange and blue. Although protected from the oxygen in the atmosphere, the tungsten metal gradually evaporates, and the filament eventually breaks. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / De Schwanberg, Victor |
Bildgröße: | 4765 px × 3744 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |