1
Definition of entropy (
熵的定义
)
：
For any closed system, it exists at equilibrium a
single valued state function called
entropy
, denoted
S
,
which is an
extensive quantity
. When the system is
changed from equilibrium A to equilibrium B, the
entropy
increment
Δ
S
equals the algebraic sum of the quotient of
heat over temperature in
any reversible processes
, i.e.,
(
δ
Q
R
)
i
is the infinitesimal quantity of energy supplied as
heat to the system reversibly at a temperature
T
i
.
(
)
(
)
(
)
i
i
Q
S
S B
S
A
T
δ
Δ
=
−
=
∑

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