# Delta-S for a Reversible, Isothermal Process

Integral form of the definition of

#### entropy

:
On page 4 of Lesson 7B, we showed that for

#### internally reversible

,#### isothermal

processes:#### Internally reversible

process from state 1 to state 2.
This equation is most commonly used to determine the change in

#### entropy

of a#### thermal reservoir

.
The main objective of this lesson is to learn how to evaluate ΔS for processes that are not

#### isothermal

.
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