Statistical physics notes pdf | statistical mechanics notes pdf | statistical physics handwritten notes free | statistical physics 7th semester notes pdf

Contents:

Statistical physics:

    The microscopic study of the macroscopic systems is called statistical physics.

👉 Classical Mechanics deals with Macroscopic objects.

👉Quantum Mechanics deals with Microscopic Objects.

👉Temperature, volume, and pressure parameters can be seen.

👉When we enclosed gas in a cylinder all eight parameters will lie.

👉The eight thermodynamics parameters 

• pressure
• volume
• Temperature 
• Enthalpy
• Gibbs
• Energy
• Internal energy
• Helmholtz free energy
• Entropy

Also read :University Physics volume 1 book by SAMUEL J. LING, TRUMAN STATE UNIVERSITY JEFF SANNY, LOYOLA MARYMOUNT UNIVERSITY WILLIAM MOEBS, PHD

👉The branches of statistical physics are shown below.

• Classical Statistics
• Quantum Statistics

👉Classical Statistics deals with an ideal gas.

👉Quantum Statistics deals with quantum gas.

👉Statistical physics tells relationship b/w Q.M and C.M.

👉There are four Laws of Thermodynamics

• Zero law tells about heat flow

• First law tells change in internal energy

• The second law tells the entropy of a system

• The third law tells the behavior of the body at zero Kelvin or absolute temperature.

Also read :University Physics with Modern Physics 13th Edition by Young and Freedom book

👉In these notes we are studying these topics:

Ideal gas, Intensive variables, Extensive variables, Maxwell's Equations, Helmotz free Energy, Enthalpy, Exact Differential Equation, Entropy, Importance of Second Law, Why we need a second law, picture of First law of Thermodynamics, Why Cp is greater than Cv? Real gas, Ideal Gas, Reasons for deviation from Ideal Behaviour, Vanderwall's equation, Adiabatic Process, RElation b/w state variables, pressure, volume, and temperature, prove Cp >Cv by Equations, Heat capacity, What is an ideal gas? Describe the work done on ideal gas at constant pressure and temperature, isothermal process, isobaric process, Explain why the temperature of gas drops in an adiabatic expansion, Basics of thermodynamics,

👉Entropy:

it represents the inevitable partial loss of an engine's ability to convert heat energy into work.

Entropy is a state function measured in J/K.

👉Why we need a second law?

The first law has some limitations which are given as 

• It does not discuss the flow of heat (direction).
• It does not provide the feasibility of a process.
• The first law says that we can make a 100% efficient engine but it does not happen.

• The first law does not comment on spontaneous and non-spontaneous processes.

👉Spontaneous process:

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  Any process which has a tendency to occur,

1. by itself
2. by proper initiation

👉Q. Why Cp is greater than Cv?

Answer:

          Consider two cylinders. Let cylinder A and B,

Cylinder A has a fixed piston and cylinder B has a Moveable piston. The gas is enclosed in both cylinders.

In-cylinder A, Only internal energy increases when heat provided But in cylinder B, there will be a change in volume and internal energy.

Also read :Statistical Mechanics for Engineers by Isamu Kusaka

That's why Cp is Always Greater Than Cv.

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