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• # Is it possible to get absolute zero temperature

Have a query regarding zero temperature? Want to know if it is possible to achieve this temperature? Find answers from our experts on this page and understand this basic concept of physics.

In main concepts of physics we study there this thing functions on absolute zero temperature. But my curiosity again and again says to if we can get absolute zero temperature or not.
Everyone is invited to answer with appropriate explanation and knowledge.
• ### Answers

3 Answers found.
• As per the principles of thermodynamics when we cool a substance then its molecular vibrations start diminishing and then there comes a stage where the motion almost ceases to exist and that is called the absolute zero. Scientists have found that this absolute zero has a value almost -273.15 degree centigrade and it is not possible to reach that zero state as some residual vibrations may be of quantum mechanical natures remain in the substance which is being cooled. One interesting thing is the mechanism used for cooling can also not get beyond the zero because there also some residual molecular motions might exist. So there is no cooling agent itself which can go below the absolute zero. So, absolute zero is a condition imposed by the structure of the material itself as its entropy cannot be reduced further.

In the Kelvin temperature scale, the absolute zero is represented as 0 degree Kelvin and everything then comes in positive numbers. For example boiling point of water is about 373 degree Kelvin. One interesting example of the low temperature is average temperature of the universe. Though there are hot bodies like sun and other stars in the universe but they are so distantly placed that the average temperature of the universe is only 2.73 degree Kelvin which is very near to the absolute zero. This measurement is based on the value of cosmic microwave background radiation in the universe.

Scientists are trying to touch the absolute zero but so far they have reached very near to it but not at it. So, that is still a unravelled mystery of physical state of matter at absolute zero.

Knowledge is power.

• The important aspect here to be noted is attaining absolute zero is difficult. Absolute zero is equivalent to -273.15 degrees centigrade. Many experiments were conducted to achieve this absolute zero but failed. But recently there is a publication in the journal of science where the scientists say that they have created the first negative absolute temperature state for moving particles.
They created a system and first cooled about 100,000 atoms to a positive temperature of a few nanokelvins, or a billionth of a kelvin. Then they cooled the atoms within a vacuum chamber. This vacuum chamber is isolated from any environmental influence. In this experiment, they could achieve negative absolute temperatures that means they have gone down to less than an absolute state. But this is in the experimental stage only.

drrao
always confident

• Absolute Zero temperature is not achievable although a temperature close to it can be attained with the use of cry coolers, dilutions refrigerators and nuclear adiabatic demagnetisation. Laser cooling has resulted in attainment of a temperature than a billionth Kelvin.
The reason that absolute zero is is an impossible goal is that the work needed to remove heat from the gas increases. Once the temperature drops and in that way , an infinite amount of work would be needed to cool something to absolute zero.
In quantum term,this can be attributed to Heisenberg 's principle signifying more precisely regarding the speed of the particle, position and vice versa.
Hence the atoms inside the experiment, there must be uncertaintity in their momentum keeping them above absolute zero, unless the experiment is considered taking the whole universe.

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