Which of the following is not a statement of the second law of
thermodynamics?
a.
A heat engine can never be 100% efficient.
b.
In a thermally insulated environment, the entropy of the
environment decreases.
c.
The universe tends to move in a direction of increasing
disorder.
d.
Perpetual motion machines are impossible.
e.
Heat spontaneously flows from a high temperature region to a low
temperature region.