Question

Easy....notes of chapter Thermal Equilibrium...

Answer 1

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Thermal Equilibrium

Two systems are said to be in thermal equilibrium if the temperatures of the two systems are equal. In mechanics if the net force on a system is zero, the system is in equilibrium.  In Thermodynamics equilibrium means all the macroscopic variables (pressure, temperature and volume) don’t change with time. They are constant throughout.

For Example: -

Consider two bodies at different temperatures one is at 300C and another at 600C then the heat will flow from body at higher temperature to the body at lower temperature.Heat will flow till both bodies acquire same temperature.This state when there is no heat flow between two bodies when they acquire the same temperature is known as thermal equilibrium. 

In the above case if consider a hot cup of coffee will become cold after sometime if it is kept on the table as there will heat flow between the hot coffee and surroundings. When the cup of coffee attains the same temperature as of room temperature then there will be no flow of heat.

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Answer 2

Thermal Equilibrium

Two systems are said to be in thermal equilibrium if the temperatures of the two systems are equal. In mechanics if the net force on a system is zero, the system is in equilibrium.  In Thermodynamics equilibrium means all the macroscopic variables (pressure, temperature and volume) don’t change with time. They are constant throughout.