Why the internal energy of a system cannot be determined?
Dear Student
Internal Energy of thesystem is the sum of all energies present in the system. Which includes the energy of all atom ,their electrons and components by their nuclei. ( Energy can be the sum of translational KE + Rotational KE+ Potential energy + Vibrational energy etc ).
Now we can't determine everything all at the same time. So we calculate change in internal energy because in that case and here we see that it is the difference so here in case if some kind of energy are constant then their difference will be neutralised. And also the depends upon the initial and final point and not on the path followed from initial point to final point.
Regards
Internal Energy of thesystem is the sum of all energies present in the system. Which includes the energy of all atom ,their electrons and components by their nuclei. ( Energy can be the sum of translational KE + Rotational KE+ Potential energy + Vibrational energy etc ).
Now we can't determine everything all at the same time. So we calculate change in internal energy because in that case and here we see that it is the difference so here in case if some kind of energy are constant then their difference will be neutralised. And also the depends upon the initial and final point and not on the path followed from initial point to final point.
Regards