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HEAT, INTERNAL ENERGY AND WORK

Thermal equilibrium and Temperature

According to Zeroth Law of Thermodynamics, Temperature ( measure of the of a body) determines the direction of flow of when two bodies are placed in thermal contact

Heat flows from the body at a temperature to the one at temperature until the temperatures becomes same and the two bodies are said to be in thermal

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Internal Energy (U)

Internal energy is simply the of the kinetic energies and potential energies of these molecules. It is the associated with the random motion of molecules of the system.

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True or False

Question 1

Internal Energy is simply a microscopic variable of the system

Question 2

Pressure, volume, temperature, and internal energy are thermodynamic state variables of the system

Question 3

Internal energy of given mass of gas does not depend on how this state of the gas came about

Nature of Internal Energy of a Gas

Internal energy of a gas purely

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Changing the state of the gas

Question

The notion of heat should be carefully distinguished from the notion of internal energy. The state of a thermodynamic system is characterised by its internal energy.

Identify the correct statement below

Hint

Heat and work in thermodynamics are not state variables. They are modes of energy transfer to a system resulting in change in its internal energy

Answers

A gas in a given state has a certain amount of heat

A gas in a given state has a certain amount of internal energy

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