According to the Law of Heat Flow, how does heat move?

The Law of Heat Flow states that heat moves from areas of higher temperature to areas of lower temperature. This principle is fundamental in understanding thermodynamics and energy transfer. In practical terms, when a hot substance comes into contact with a colder one, the heat energy from the hot substance transfers to the cold one until thermal equilibrium is reached. This concept can be observed in daily life, such as when you touch a hot stove and heat flows from the stove to your cooler hand, causing you to feel warmth and potentially getting burned.

The other choices do not align with the principles of heat transfer; for instance, stating that heat moves from cold to hot contradicts the natural flow of thermal energy, and the claim that heat always stays within the same substance ignores the interactions between different materials. The idea that heat transfers only through liquids is also incorrect, as heat can move through solids, gases, and liquids by conduction, convection, and radiation.