  The frequent misunderstanding of information entropy is pointed out. It is
shown that, contrary to fortuitous situations and common beliefs, there is no
general interrelation between the information entropy and the thermodynamical
entropy. We point out that the change of information entropy during measurement
is determined by the resolution of the measurement instrument and these changes
do not have a general and clear-cut interrelation with the change of thermal
entropy. Moreover, these changes can be separated in space and time. We show
classical physical considerations and examples to support this conclusion.
Finally, we show that information entropy can violate the Third Law of
Thermodynamics which is another indication of major differences from thermal
entropy.
