if an object does not have any motion will it have entropy??
Yes, even if an object is at rest and does not have any macroscopic motion, it can still have entropy. Entropy is a measure of the disorder or randomness in a system. It is a concept from thermodynamics, a branch of physics that deals with the study of energy and its transformations.
The entropy of a system can increase even if there is no macroscopic motion because entropy is related to the distribution and arrangement of particles and energy within a system. At the microscopic level, there can still be random thermal motion of particles (atoms and molecules) within the object, contributing to its entropy.
In summary, the presence of entropy is not solely dependent on macroscopic motion but is related to the microscopic arrangement and distribution of particles and energy within a system.
if no then why entropy of all substances is not zero at absolute zero kelvin??
The entropy of a substance is not necessarily zero at absolute zero Kelvin due to the third law of thermodynamics, also known as the Nernst heat theorem. The third law states that the entropy of a perfect crystal approaches zero as the temperature approaches absolute zero, but it doesn't dictate that the entropy must be exactly zero for all substances.
In practical terms, achieving absolute zero is challenging, and perfect crystals are theoretical constructs. Real substances have imperfections, such as defects in their crystal lattice or residual thermal motion, which prevent their entropy from being precisely zero even at absolute zero.
So, while the third law of thermodynamics implies that the entropy of a perfect crystal would be zero at absolute zero, real substances deviate from this ideal behavior due to imperfections and quantum effects. As a result, the entropy of most substances does not reach zero at absolute zero Kelvin in practice.
