The quest of how molecules impact energy systems is a micro-scale task, but its implications reverberate throughout the meso-scopic world of energy systems and the broader field of chemistry. The connections between molecules and energy systems are complex and dynamic at the molecular level. Think about how thermal fluid molecules behave in a heat transmission system, for example. These molecules are crucial for effectively transferring thermal energy and are often present in heat transfer fluids like water or specialized coolants. The efficiency of heat absorption or release is determined by their molecular interactions, which affects the performance of a variety of applications, from cooling systems in electronic devices to steam turbines in power plants. The relationship between molecules and energy systems is significant to contemporary science and engineering because it is essential for improving the overall efficiency and sustainability of energy systems on a bigger scale.