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In thermodynamics, absolute zero is the temperature, (denoted by 0 Kelvin = -273.15 deg C), when all thermodynamic activity ceases.

The molecules of all bodies are in constant state of vibration. Heating a body is simply adding energy to the body so that its molecules vibrate more rapidly. Absolute zero is the point at which such vibrations cease but it is a temperature that cannot be attained with normal matter.


In January 2013, though, a researcher at the University of Munich announced that they had attained temperatures below absolute zero.

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