Work Done Kinetic Energy Contribution Internal Energy Units Degrees of Freedom Work Done in Thermodynamic Processes First Law of Thermodynamics Definition of Internal Energy Calorimetry and Internal Energy Potential Energy Contribution Specific Internal Energy Microscopic Interpretation Joule’s Law Extensive Property Isothermal Process and Internal Energy Internal Energy Dependence on Temperature Diatomic Gas Sign Convention Internal Energy of an Ideal Gas Isochoric Process and Internal Energy Monatomic Gas Heat Transfer Adiabatic Process and Internal Energy Microscopic Interpretation of Internal Energy Temperature Dependence Equipartition of Energy