Thermal Equilibrium and Zeroth Law of Thermodynamics
- If the state of a system is represented by pressure volume and temperature and entropy then it is called a thermodynamic system.
- Open system is the system in which both heat and matter can exchange with surroundings.
- A closed system is the system in which only heat is exchanged with the surroundings.
- A isolated system is the system in which neither heat nor matter is exchanged with surroundings.
- If two bodies are at the same temperature then they are said to be in thermal equilibrium when bodies are in thermal equilibrium no exchange of heat takes place.
- A system is said to be in thermal equilibrium when it is in a state of thermal mechanical and chemical equilibrium.
- From zeroth law of thermodynamics if two bodies A and B are in thermal equilibrium independently with a third body C, then the bodies A and B will also be in thermal equilibrium with each other.
- Zeroth law of thermodynamics leads to the concept of temperature.
- Heat flows from a body at higher temperature to a body at lower temperature.
- Adiabatic wall is an insulating wall that does not allow heat energy to pass through it. Diathermic wall allows heat to pass through it.
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