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A pump transfers mechanical energy to a fluid by raising its pressure. The pressure of a flowing fluid is associated with its mechanical energy. Pa=N/m2=N.m/m3=J/m3 Energy per unit volume and P/ρ has unit J/Kg which is energy per unit mass. The book I am studying from (Thermodynamics: An...

I came across the continuum model when I was studying thermodynamics from the book 'Thermodynamics: An Engineering Approach'

Are we motivated to apply the continuum model because, when we view a substance in the gaseous phase on a molecular scale, the molecules are constantly and randomly moving in all directions? If we had tools for measuring intensive properties at different points, these properties would not assume...