️ Thermodynamics – Complete Physics Notes | NEET + Class 11 | Formulas + PYQs

CHAPTER-12 * THERMODYNAMICS
&
Conversion of heat--work

Thermodynamic system & Gas cylinder Baundary
N
-

system surrounding


Energy matter

↑ OPEN SYSTEM - -

2 CLOSED SYSTEM - X
3 ISOLATED SYSTEM X X



THERMAL EQUILIBRIUM = Two bodies are said to be thermal equilibrium
when no heat flows from one body to another body,
when both bodies are at the same temp .




zeroth law of thermodynamics .

If two independent system present in
thermal equilibrium condition with another
I
Isolated wall common
system then temp, of these system

- ↑ & 1
&
& - ↑
-
is same .




A B
Ta Ty Tc
& · - 7
& - - &
S
= =

& & M - & & #
M - & ↑




& I & ↑
- - - & &




~

& & & -
C &
~ ↑ & Note- It's
# explain only temp , and thermal
-
-




equilibrium
- - ~ &




~
condition .
Conducting wall




Thermodynamic work I
Cross-section A

work done Forux displacement &
Frictionless
-
=
1 11/1 /
du↑
- and movable
PAXdH iiii ,
M




dw =
,
Piston
in volume
&V change D
I
-↑ - & ↑


But Adu =
↑ I - --



of Gas ! A - -
T
T & A --

Cylindej
dw = PdV
Gas
Total work-done
if Constant Cisobaric processe
o
Year
&
= pressure =




w then w =
par - w = P(V v] -




w =
POV

,
,