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What is absolute zero and where is the coldest known place in the Universe? [Science]
posted January 13 2013 22:32.05 by Giorgos Lazaridis

So what is the absolute zero? Sir William Thomson, 1st Baron Kelvin, conducted some experiments to find out what heat is. He wanted to test a new theory that heat is the movement of molecules in a substance. So he tried to remove the heat from a substance, and he then realized that there is a point that all the kinetic energy would removed from the substance. He also realized that, unlike the boiling point that is different for every substance, the point where the kinetic energy becomes zero is the same for all substances! And that is the absolute zero point, -273,15oC, 0 Kelvin, the point where noting can get any colder, since there is no kinetic energy left to drain.

Since then, scientists have been trying to reach this absolute zero but with no real success. They've managed to reach 99.999%, but no further. The reason is not the lack of technology nor the lack of good refrigerators. Instead, the reason is... Quantum physics. In the world of quanta, nothing can be certain, not even the position or the momentum of a quanta at any given time. That being said, the kinetic energy inside any given substance cannot become zero, because then we would at least know the momentum of all quanta in that substance, since 0 kinetic energy means 0 momentum. Nevertheless, getting THAT close to absolute zero, crazy things start to happen.

Watch the following video to learn more about the absolute zero, and also this question:
- What is the coldest place in the known universe????

Photo: The rapid expansion of gases leaving the Boomerang Nebula causes the lowest observed temperature outside a laboratory. [Source: wikipedia]

[Link: Sci Show]

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