Thermodynamic/ˌθɜːrməʊdaɪˈnæmɪk/ Definition 1 of 2Pro Tip 1/3Technical Usage Used mainly in scientific discussions about energy conversion and efficiency. Engineers often analyze the thermodynamic cycle of a car engine. Pro Tip 2/3Heat & Work Focuses on the relationship between heat and the work or output it produces. Thermodynamic studies can improve the performance of heating systems. Pro Tip 3/3Energy Systems Refers to systems where energy transformation is significant, like engines or power plants. The thermodynamic efficiency of this plant is unmatched.