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![Temperature scales](https://cdn.mos.cms.futurecdn.net/798E4orBLPek8HGzDeycxV-320-80.jpg 320w, https://cdn.mos.cms.futurecdn.net/798E4orBLPek8HGzDeycxV-450-80.jpg 450w, https://cdn.mos.cms.futurecdn.net/798E4orBLPek8HGzDeycxV-650-80.jpg 650w, https://cdn.mos.cms.futurecdn.net/798E4orBLPek8HGzDeycxV-970-80.jpg 970w, https://cdn.mos.cms.futurecdn.net/798E4orBLPek8HGzDeycxV-1024-80.jpg 1024w, https://cdn.mos.cms.futurecdn.net/798E4orBLPek8HGzDeycxV-1200-80.jpg 1200w)
What is the third law of thermodynamics?
By Jim Lucas last updated
Reference According to the third law of thermodynamics, the entropy of a perfect crystal is zero when the temperature of the crystal is equal to absolute zero (0 kelvin).
![The Menlo Park lab of Thomas Edison, who invented the lightbulb, is shown here after its relocation to the Henry Ford Museum in Greenfield Village, Dearborn, Michigan. The arrow on the vacuum pump (center) marks the site of Edison's recreation of the lighting of the incandescent bulb on Oct. 21, 1929.](https://cdn.mos.cms.futurecdn.net/xjSeXXHYgmAyHioQpRdZ9R-320-80.jpg 320w, https://cdn.mos.cms.futurecdn.net/xjSeXXHYgmAyHioQpRdZ9R-450-80.jpg 450w, https://cdn.mos.cms.futurecdn.net/xjSeXXHYgmAyHioQpRdZ9R-650-80.jpg 650w, https://cdn.mos.cms.futurecdn.net/xjSeXXHYgmAyHioQpRdZ9R-970-80.jpg 970w, https://cdn.mos.cms.futurecdn.net/xjSeXXHYgmAyHioQpRdZ9R-1024-80.jpg 1024w, https://cdn.mos.cms.futurecdn.net/xjSeXXHYgmAyHioQpRdZ9R-1200-80.jpg 1200w)
Who invented the lightbulb?
By Elizabeth Peterson, Callum McKelvie published
Reference Though Thomas Edison is credited as the man who invented the lightbulb, several inventors paved the way for him.
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