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List the characteristics of internal energy. |
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Answer» The internal energy of a SYSTEM is an extensive property. The internal energy of a system is a state function. The change in internal energy of a system is expressed as `DeltaU-U_(f)-U_(i)` in a cyclic process, there is no internal energy change. ` DeltaU_("cyclic") = 0 ` If the internal energy of the system in the final state `(U_(f))` is less than the internal energy of the system in its initial state `(U_(i)) , "then" Delta U`would be NEGATIVE. `Delta U = U_(f) - U_(i) = - ve(U_(f)LT U_(i))` If the internal energy of the system in hte final state `(U_(f))` is greater than the internal energy ofthe system in its initial state `(U_(i)) "then" DeltaU`would be positive. `Delta U = U_(f) - U_(i) = + ve (U_(f)gt U_(i))` |
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