Bulb diameter7 hundredths m
4.7 tenthsBird nest diameters
7.7 hundredthsWindow widths
Photo from Wikimedia Commons
Edison Light Bulb
The glow that ended the age of darkness/Inventions & Discoveries
Thomas Edison demonstrated his practical incandescent light bulb on December 31, 1879. His carbonized bamboo filament version lasted over 1,200 hours, making electric lighting commercially viable for the first time. The original bulb was about 7 cm in diameter and produced roughly 16 candlepower of light, equivalent to about 13 lumens per watt. Edison did not invent the light bulb outright, but his version was the first practical and long-lasting design.
Measurements
Overall length1.2 tenths m
4 thousandthsWater polo pools
3.4 hundredthsParallel bar lengths
6 thousandthsWindmill heights
Mass3 hundredths kg
2 billionthsBrooklyn Bridge masses
3 millionPollen grains
Power consumption100 W
3.3 tenthsStair climbers
1.8 tenthsGarage door openers
Filament lifespan4.3 million s
1.9 thousandthsQueen Elizabeth II reigns
4.3 billionCamera shutters
3.4 tenthsSemesters
About 1,200 hours
Filament temperature2,700 K
7.24Running car engines
4.7 tenthsSun surfaces