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The micro internal energy approach focuses on the energy of individual particles within a system, while the macro internal energy approach looks at the overall energy of the entire system.
Internal energy can be calculated using the equation U = Q - W, where U is the internal energy, Q is the heat added to the system, and W is the work done by the system.
The internal energy of a system is affected by temperature, pressure, and the number and type of particles present in the system.
Yes, internal energy can be changed through the addition or removal of heat or work from the system.
The first law of thermodynamics states that energy cannot be created or destroyed, only transferred or converted. This applies to both the micro and macro internal energy approach as energy is conserved within the system as a whole and at the individual particle level.