Scientists gas of atoms in a ” negative temperature ” state

Physicists successfully achieved in the laboratory atomic gases “negative temperature” states. The so-called “negative temperature” is the opposite of the positive temperature at minus temperatures in the state’s energy level is greater than the number of atoms in a low energy level state atomic number.

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A system, when the number of atoms in a high energy level is greater than the number of atoms in a low energy level, we will define the state of the system at a negative temperature.

According to foreign media reports, physicists successfully achieved in the laboratory atomic gases “negative temperature” (negative temperature) conditions.

Typically, in the positive temperature range, the number of atoms in a low energy level is greater than the number of atoms in a high energy level, which in the physical distribution pattern is called “Boltzmann distribution” (Boltzmann distribution). After the time when the object is heated to form their atoms absorb energy, it will jump to a higher energy level were to go.

The so-called “negative temperature” is the opposite of the positive temperature at minus temperatures in the state’s energy level is greater than the number of atoms in a low energy level state atomic number.

Physicists at the University of Munich, Germany Ur Schneider (Ulrich Schneider), said: “Anti-Boltzmann distribution is an object in a negative temperature state flag, which is what we now realize is a negative temperature state the actual temperature of the gas. and not less than the absolute zero! contrary, but more heat from the theory, any positive or hotter than the temperature state, by definition, the transition to a high temperature in an infinite negative temperature range. “

As we hoped, in a negative temperature state of the object has a very strange character. For example, under normal circumstances, the flow of low temperature heat is the object (the cooling temperature of the object, the object is heated to a low temperature) from the hot object, until the temperature is equal. However, when the flow of heat from the temperature of the object being negative when the temperature of the object, never reach thermal equilibrium state.

Another peculiar nature of negative temperature and entropy (entropy) concerned, entropy is a measure of the physical system orderly. When the object to release of heat, will increase the entropy of the surrounding environment, so that they become more confusing. However, when the temperature of an object in the negative heat emission, which can absorb the entropy of the surrounding environment, to make it more orderly.

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