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post #21 of 26
i thought all molecular activity stopped at absolute zero. what could we learn from that that we can't learn by just taking a picture?
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post #22 of 26
Quote:
Originally Posted by MrBungle View Post
i thought all molecular activity stopped at absolute zero. what could we learn from that that we can't learn by just taking a picture?
Well... matter by definition require mass and motion. If matter stopped, then it can't be matter.


Also, how do they achieve such low temperatures? They isolate a slowest moving particles from a gas cloud using a magnetic/laser funnels.... You can't make anything colder without using something colder. Any method of cooling would require something colder otherwise it would add heat to the particles. Thermodynamics! Absolute Zero is impossible.

Again, check Bose-Einstein Condense.... it is a state of matter that we recently discovered. Atoms co-exist in the same space! Quantum Physics is strange...
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post #23 of 26
Quote:
Originally Posted by DuckieHo View Post
Well... matter by definition require mass and motion. If matter stopped, then it can't be matter.


Also, how do they achieve such low temperatures? They isolate a slowest moving particles from a gas cloud using a magnetic/laser funnels.... You can't make anything colder without using something colder. Any method of cooling would require something colder otherwise it would add heat to the particles. Thermodynamics! Absolute Zero is impossible.

Again, check Bose-Einstein Condense.... it is a state of matter that we recently discovered. Atoms co-exist in the same space! Quantum Physics is strange...
There are ways to cool things without sticking it next to something colder. The thermoelectric effect, for example, is how the coldplate cools down. Phase change also achieves its temperatures through a different mechanism, specifically by using the gas's energy for decompression
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post #24 of 26
Quote:
Originally Posted by rabidgnome229 View Post
There are ways to cool things without sticking it next to something colder. The thermoelectric effect, for example, is how the coldplate cools down. Phase change also achieves its temperatures through a different mechanism, specifically by using the gas's energy for decompression
Not quite.... how do you get the object you are cooling to a lower temperature? By transporting heat away. However, phase and thermoelectric use a physical means of heat transport. Just the atoms existing in the near zero area would raise the heat. Thermoelectric becomes exponential more useless at lower temps. Phase change still requires a lot of energy for the phase change to occur.
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post #25 of 26
Quote:
Originally Posted by DuckieHo View Post
Not quite.... how do you get the object you are cooling to a lower temperature? By transporting heat away. However, phase and thermoelectric use a physical means of heat transport. Just the atoms existing in the near zero area would raise the heat. Thermoelectric becomes exponential more useless at lower temps. Phase change still requires a lot of energy for the phase change to occur.
I'm not saying that either methods would allow you to reach abs zero - just illustrating that there are other ways of cooling things. Any method that would reach it would necessarily be very complex
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post #26 of 26
absolute zero research is important to quantum computers because of a quantum property known as superposition. the actual quantum "processor" will have a bunch of qubits inside it that all have a superposition of one and zero. this can be 0+1, 0+0, 1+1, or any of an infinite possibilities in between.

now, the problem with superposition is that once it's observed or acted on, it decoheres into one OR zero. so a method needs to be developed to observe and act on the qubits without actually doing so.

the problem is, whatever this quantum system is contained in, the forces of the outside world are still acting on it in some way. the only way to correct this is to cut out any outside influence, which is where absolute zero comes in. some kind of insulation that allows absolutely no energy transfer between the inside and the outside.

for more information, go to wikipedia, howstuffworks, or any number of search engines
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