Oct 10 , 2018
Heat and glass are a bad combination, and you get both in an incandescent (read: old-fashioned) light bulb. Thomas Edison101 here: Light is produced when an electrical current runs through a tungsten filament inside the bulb. The filament heats up and, voila, let there be light! But if the bulb’s base was not properly sealed by the manufacturer, the base could melt, changing the pressure of the heated gas inside the bulb. Then, boom!