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::As I understand it, it's the Heisenberg Uncertainty Principle that limits the ability of substances to be at absolute zero. You cannot simultaneously know the position and velocity of a particle precisely. Since temperature is molectular motion, and absolute zero is a state of "no molectular motion at all," if you knew the position of a particle and that its temperature was absolute zero, you could in theory violate the Uncertainty Principle under certain circumstances. Since I'm not a physicist, though, I'll leave it to others to write the clarification in the article. <font color=navy>--[[User:JesusSaves|JesusSaves]] 23:28, 11 March 2007 (EDT)</font>
::As I understand it, it's the Heisenberg Uncertainty Principle that limits the ability of substances to be at absolute zero. You cannot simultaneously know the position and velocity of a particle precisely. Since temperature is molectular motion, and absolute zero is a state of "no molectular motion at all," if you knew the position of a particle and that its temperature was absolute zero, you could in theory violate the Uncertainty Principle under certain circumstances. Since I'm not a physicist, though, I'll leave it to others to write the clarification in the article. <font color=navy>--[[User:JesusSaves|JesusSaves]] 23:28, 11 March 2007 (EDT)</font>
:::Actually the uncertainty principle doesn't need to be invoked. Since the Cosmic Background Radiation has an observed temperature of around 3 Kelvins any object in the currently observable universe would be at least that warm since it would be bathed in microwave radiation. Because the universe is filled with some degree of energy everywhere absolute zero is impossible. Even the best cooling system would heat a cooled object via electro-magnetic radiation to a point above 0 Kelvin. --[[User:WOVcenter|WOVcenter]] 02:37, 12 March 2007 (EDT)