System

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System is the spheres where chemical and physical process happens and this part is under thermodynamic study that is separated from the surroundings. The example of a system is oxygen in a cylinder. The outside of the cylinder is the surroundings. On the basis of phase, system are homogeneous and heterogeneous. The system consists of one phase is called homogeneous. The system consist with more phase is called heterogeneous system. The examples of thermodynamic homogeneous system is single solid, gas, true solution, mixture of gasses. Examples of heterogeneous system is ice on water. On the basis of the boundary, thermodynamic system are in three class. These are isolated system, closed system and open system. Isolated can not transfer matter and energy both. Closed system cannot transfer matter but can transfer energy in form of heat. The open system can transfers both heat and matter.

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Mass energy transformation equation

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Attractive force

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