Discussion
What does transient condition means?
Answer: B
A transient condition is conduction when temperature at a point varies with time.
In transient (unsteady) conduction the temperature at a point changes with time, \(\partial T/\partial t \neq 0\), as when a hot casting cools or a cold slab is heated. In steady conduction the temperature at every point stays fixed.
The other options describe amounts or durations, not the time-dependence that defines the term. A short period of heat transfer can be steady, and a small heat flow or a small temperature difference can be either steady or transient.
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