In any type of scientific study, attention is focused on a region of space or a finite portion of matter which we can call a system. Anything which is outside the system and which affects its behaviour can be called the surroundings. The beaviour of a system can be studied from two separeter points of view, macroscopic and microscopic. In studying the behaviour of a system, we must choose suitable quantities (or coordinates) which define the states of a system.
KeywordsHeat Engine Thermodynamic System Molar Heat Capacity External Work Emissive Power
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