# Thermodynamics

## What is thermodynamics?

Thermodynamics is one of the types of physics which is the combination of two words ” thermal + heat”, thermal means heat, and dynamic means motion. So literally thermodynamic means study of the motion of heat. There are three laws of thermodynamics which are:

Thermodynamic plays a vital role in our lives.
Think!
Without TD…..

• We were not able to get the energy to move. We get energy from food as a result of the metabolism process which is the example or application of the first law of TD.
• Refrigerators, air conditioners,  cars, airplanes, buses, ships all needed a thermodynamic system to work.
• Heat pumps and heating systems are due to TD.
• Electricity is now being produced by using a thermodynamic cycle or process.

It is applicable only in the macroscopic world and not in the microscopic.
Learning Objectives

• State the Basic Postulates of the kinetic theory of gasses
• Derive gas laws on the basis of kinetic theory
• Internal Energy of an Ideal Gas
• To understand the term work and heat in thermodynamics
• Differentiate between isothermal and adiabatic processes
• Explain the molar specific heat of a gas
• Apply the first law of thermodynamics to derive Cp – Cv = R
• Explain the second law of thermodynamics and its meaning in terms of entropy
• Understand the concept of reversible and irreversible processes
• Define the term heat engine
• Understand and describe Carnot Theorem
• Describe temperature scales
• Describe the working of petrol and diesel engine
• Explain the term entropy
• Appreciate the environmental crisis as an entropy crisis.

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