The lightbulb has been shedding light in our homes and workplaces since the 1870s. and it’s been doing a sterling job considering the light it creates is a by-product of the chemical processes going on.
Essentially, the lightbulb is a very thin filament of hard-to-melt metal – tungsten, usually – encased in a glass bulb filled with inert gases so that the filament doesn’t oxidise and disintegrate. The electricity causes the wire to glow and a portion of that energy is turned into light.
But, it turns out, the lightbulb might have been more accurately called the ‘heatbulb’ – most of its energy gets turned into heat. Which is why the bulbs are being slowly phased out in favour of alternatives like LED lights.
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