A system is that section of universe in which we might be interested. To demarcate a object we have to describe a system boundary. In thermodynamics system is defined according the boundary.
Classification:
(i.) Open System - Here the system boundary is such that energy and matter can enter or leave the system freely. Infect the system boundary here is imaginary.
(ii.) Closed System - Here the system boundary such that only energy but not matter may leave or enter freely. The system boundary is called diathermic.
(iii.) Isolated System - Here the system boundary such that neither energy nor matter can leave or enter the system. The system boundary is called adiabatic
This thermodynamic system is described by state variable viz. temperature, volume, pressure. Any two of these can completely define the state of the system. This is because of the perfect gas equation.
PV = nRT
In that if any two of (P, V, T) Is given then the third is given if n is provided.
THERMODYNAMIC STATE: Thermodynamic state of a confined gas can be given by a point on a pressure vs. temperature or volume vs. temperature or pressure vs. volume relation.
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