Internal energy is the total potential energy (from intermolecular forces) and kinetic energy (from particle motion) within a system due to the motion and interactions of its particles. In simple terms, it is the total energy in a system. Internal energy changes when heat is added or removed or when the system performs some work.
<p><span data-preserver-spaces="true">Internal energy is the total </span><strong><span data-preserver-spaces="true">potential energy </span></strong><span data-preserver-spaces="true"> (from intermolecular forces) and </span><strong><span data-preserver-spaces="true">kinetic energy</span></strong><span data-preserver-spaces="true"> (from particle motion) within a system due to the motion and interactions of its particles. In simple terms, it is the total energy in a system. Internal energy changes when heat is added or removed or when the system performs some work.</span></p>
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