Detailed Explanation of Macroscopic Viewpoint

Matter is composed of atoms. But most of the substances exist in molecular form. In classical thermodynamics where a large number of molecules are considered for thermodynamic properties. For example, if it is said a substance is at 100 DegC then is it assumed that the average temperature of all the molecules is similar. Some of the molecules maybe at higher or lower temperature, but in a Macroscopic point of view the average is taken of the total mass. Same thing holds good for Pressure, volume etc.

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