What is absolute zero in kinetic theory of matter and kinetic energy zero at absolute zero temperature?
At absolute zero temperature, particles don't possess any motion. Hence, no kinetic energy will be there. The lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy. Absolute zero is equal to 0°K, -459.67°F, or -273.15°C. At temperatures approaching absolute zero, the physical characteristics of some substances change significantly. As a sample of matter is continually cooled, the average kinetic energy of its particles decreases and eventually, one would expect the particles to stop moving completely. Absolute zero is the temperature at which the motion of particles theoretically ceases.
Rk Naresh
The concept you are presenting is not correct, because when you go at very low temperature, quantum kinetic theory must be applied and the idea of motion itself become unclear. Think about the harmonic oscillator: The lowest possible energy is not the zero energy but 1/2hv.
Moreover you must distinguish between Boson and Fermions. These last cannot collapse in the ground state and therefore not all the particles "stop moving".
At Absolute Zero temperature all the molecules are expected to have no kinetic energy and hence no molecular motion. Absolute Zero is a theoretical value. All molecular motion ceases if the temperature is reduced to absolute zero, hence kinetic energy will be equal to zero at 0 kelvin. The attainment of absolute zero temperature for a gas molecules causes the kinetic energy tends to zero. The absolute zero can be attained by producing approximate zero kinetic energy for a particular gas molecules. To have something at absolute zero in theory means it has no kinetic energy, but that's not possible, because then the materials would cease to exist as normal matter, due to laws of quantum mechanics. The Kelvin scale is based on absolute zero and starts at 0K. Absolute zero is where the kinetic energy of the particles is zero. That means all the motion between particles will cease. Temperature at which the root mean square velocity of the gas molecules reduces to zero it means, molecular motion ceases at absolute zero.
Absolute zero temperature is the minimum limit of temperature that a physical body can have in the universe.
Within the framework of the applicability of thermodynamics, absolute zero is unattainable in practice. Its existence and position on the temperature scale follows from the extrapolation of the observed physical phenomena, while such extrapolation shows that at absolute zero, the energy of thermal motion of molecules and atoms of matter should be zero, that is, the chaotic motion of particles ceases, and they form an ordered structure, occupying a clear position in the nodes of the crystal lattice (liquid helium is exception).
However, from the point of view of quantum physics and at absolute zero temperature, there are zero fluctuations, which are caused by the quantum properties of particles and the physical vacuum surrounding them.