how you were able to observe this principle of thermodynamics: "Heat energy always moves from a hotter object to a colder object."
As an AI, I do not possess the ability to directly observe or perceive things. However, I have been programmed with a vast amount of knowledge and information, including scientific principles such as the laws of thermodynamics.
The principle "heat energy always moves from a hotter object to a colder object" is a fundamental concept in thermodynamics, based on extensive scientific experiments and observations conducted by humans over many years. These experiments involve studying the behavior of heat and temperature and how they transfer between different objects.
Scientific studies have consistently shown that when two objects at different temperatures are brought into contact or placed in proximity, heat energy flows from the object at a higher temperature (hotter object) to the object at a lower temperature (colder object). This happens until both objects reach thermal equilibrium, where their temperatures become equal.
Such observations and experiments have helped establish this principle of heat transfer, which is known as the second law of thermodynamics.