Wednesday, January 23, 2013

Absolute Zero Definition

                            Absolute zero is the coldest possible temperature. ( absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance ) . It is the temperature at which entropy reaches its minimum value. A system at absolute zero still posses quantum mechanical zero point energy, the energy of its ground state. The kinetic energy of the ground state cannot be removed. The zero point of any thermodynamic temperature scale, such as Kelvin or Rankine scale is set as absolute zero.

Absolute zero is defined as,
O K on the kelvin scale
-273.12 degree on the Celsius scale
O  R on the Rankine scale.

               In classical kinetic theory there should be no movement of individual molecules at absolute zero, but experimental evidences shows this is not in the case.

No comments:

Post a Comment