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Saturday, 13 January 2018

Thermodynamics Revision Sheet

              Thermodynamics Revision Sheet

TF=9/5 TC + 32°
TC = TK - 273.15 K
The pressure,volume and temperature in kelvin of such gases obey the equation
PV=nRT ----(1)
Thermal expansion


Specific Heat Capacity=ΔQ/mΔT

Gas Laws
Boyles Law: PV=constant
Charles Law : V/T=constant
Dalton Law of Partial Pressure: P=P1 + P2 +P3
Root mean Square Velocity
Mean  Velocity
Most Probable Velocity
Vrms > Vm > V

Average kinetic Energy of Gas=3/2nRT

First law of Thermodynamics


Gas Processes

Isothermal Process : PV=constant ,ΔU=0,Q=W,Molar Specific Heat=infinity
Adaibatic Process : PVy=constant,Q=0,ΔU=-W,Molar Specific Heat=zero
Polytropic Process : PVn=constant,Molar Specific Heat=[R/(y-1) + R/(1-n)]
Volume Constant : P/T=constant W=0,ΔU=Q,Molar Specific Heat=Cv
Pressure Constant : V/T=constant ΔU=Q-W ,Molar Specific Heat=CP

Internal energy depends on Temperature.
So for same temperature change ΔT

Molar Specfic Heat Capacity of any process is given by

C=Cv + Pdv/ndT where n is no of moles of the gas

Workdone by Gas= ∫PdV

Heat Conduction


Wein displacement lawλT4=Constant

Stefan's Law

Newton law of Cooling


Problem Solving tips
1.     Net Heat flow at a junction is Zero
2.     Internal Energy does not depend on the path
3.     Internal Energy in a cyclic  Process is zero
4.     Heat is positive when given to the system and negative when taken out of the system
5.     Workdone by the system on the surrounding is positive while the workdone on the system by the surrounding is megative

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