It is impossible to reach the absolute zero
The physical behavior of all materials is
described by a theory called
"Thermodynamics", which is based on three
fundamental postulates known as the "basic laws
of thermodynamics". These laws cannot be
proved. They are basic assumptions that we accept
in order to explain the multitude of phenomena in
The unattainability of absolute zero is one
of these basic law (the third law). The
other laws are the conservation of energy (the
first law), and the fact that the entropy of the
universe cannot decrease (the second law).
The "world record" for the lowest temperature
is achieved using "laser cooling"
techniques, which can bring small systems (of
the size of about 1 billion atoms) down to 1
billionth degree Kelvin.
It is the heat input from the outside world (or
"heat leak") into an experiment which prevents
The third law of thermodynamic can be also
related to quantum mechanics (which
governs the behavior of law temperature systems).
By definition, absolute zero is the temperature
at which all molecular motion ceases and no energy
present. But quantum mechanics (Heisenberg
Uncertainty Principle) states that even at
absolute zero some energy must be present.
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