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The internal energy is thetotal amount of kinetic energy and potential energy of all the particles in the system. When energy is given to raise the temperature,particles speed up and gain kinetic energy.

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  • What is the internal energy of a system?

  • The internal energy is the total of all the energy associated with the motion of the atoms or molecules in the system. Microscopic forms of energy include those due to the rotation, vibration, translation, and interactions among the molecules of a substance.

  • What is the relationship between internal energy and work done?

  • The first law of thermodynamics postulates that the increase in internal energy is equal to the total heat added plus the work done by the environment. If it is an isolated system, it remains constant. Internal energy is a state function. Its value depends only on the current state of the system.

  • What is the law of internal energy?

  • Internal energy. The law also implies that if both heat and work are involved in the change of state of a system, then the change in internal energy is equal to the heat supplied to the system minus the work done by the system.

  • Is internal energy intensive or extensive?

  • Internal energy is a state function of a system and is an extensive quantity. One can have a corresponding intensive thermodynamic property called specific internal energy, commonly symbolized by the lowercase letter u, which is internal energy per mass of the substance in question.

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