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# # 12-2-20# #
high enpropy
low temp hightemp
THOUGHT EXPERIMENT
QQ
oa
Q
!
i doo
odlo
lo
lowenpropy
blue e complete slop. energy is
conserved, burithis will never happen
bic it violans the 2nd law, bic entropy
would have decreased.
D
0
0
2n4 LAW OF THERMODYNAMICS
the entropy of an isolated system never
decreases. The entropy either increases
until equilibrium or will stay the same
it already @ equilibrium.
example
os
Hul more disoriteret,
00
the more entropy.
The more spread out
OO
2 energy, the more enmopy
2 has a higher entropy, ble it is more
disorganized than state 1
ooo
oo
0
isolated system: system that does
not interact w/ surroundings.
nothing leaves or enters & no energy
is transherred.
entropy it is a state function,
depends on the con guration
not on the path toget there.
A
way
ENTROPY CONT.
irreversible process: the system can't be restored to B original since
spontaneously
reversinie process: very rare, most cases particles are equilibrium,
entropy is constant, & no energy is lost.
)))
too
low entropy
nigh enhopy
7
bl 11
Q
we can measure time w/ entropy. so @ the start of the world hare
was low entropy and it kept increasing
PRACTICE
a
o gast
gas x is not an isolated system, ble
o gas y
gas Y can interact w/ it.
0Q
yas Xºs entropy decreases
- Sx + Sy = + As
g ya
6
of
Go