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 meant by specific internal energy?
For any material or repulsion between the individual molecules. 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.
What is internal energy of a thermodynamic system?
The internal energy U of a thermodynamic system is the energy it contains. It can be due to the motion of its particles (in the form of kinetic energy) and/or to their interactions. It generally depends on the state variables of the thermodynamic system (if it is a gas, p, V, T).
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 happens to internal energy when the system is isolated?
If the system is isolated, its internal energy remains constant. The internal energy is a function of the state of the system, since its value depends only on the current state of the system and not on the chosen path to reach it. It is an extensive property.