This is a fundamental principle of thermodynamics called the Second Law of Thermodynamics. It essentially states that heat naturally moves from areas of higher concentration (higher temperature) to areas of lower concentration (lower temperature).
Think of it like this:
* Hot coffee: The coffee is at a higher temperature than the air around it. Heat flows from the coffee to the air, making the coffee cooler and the air warmer.
* Ice cube in water: The ice cube is at a lower temperature than the water. Heat flows from the water to the ice cube, causing the ice cube to melt and the water to cool slightly.
This is why we feel cold when we touch something at a lower temperature than our body. Heat flows from our hand to the cold object, making our hand feel cold.
