Why does energy and heat transfer from a hot body to a cold one?

The Nature of Heat, Its Transfer and the Potential of Matter

First Principle (The Nature of Heat and Innate Potential):
Matter is inherently and perpetually capable of motion and activity.

Heat is not a fluid or a separate substance; it is the observable manifestation of this latent potential in atoms and molecules. In fact, what we call “temperature” is the degree to which this inherent potential is realised. Even at absolute zero (−273 degrees Celsius), atoms are not entirely motionless (zero-point energy). Motion, then, is not an incidental property but an enduring feature of matter.

Second Principle (Conditions for the Potential to Manifest):
The potential for motion does not become actual without suitable external conditions.

For the latent motion in an object to manifest and for the object to become “warm,” two essential conditions must be met:

1. Structural condition (capacity to receive):
The object must be able to receive and transmit vibrations. Some materials, such as metals, have a greater capacity to manifest this motion because of their crystalline structure and free electrons. Others, such as wood or plastic, do not display this potential as readily.

2. Threshold condition (the necessary energy input):
The energy received from the surroundings must reach a critical threshold in order to overcome internal barriers, such as molecular bonds, crystalline order or cohesive forces. Until this threshold is reached, the object shows no perceptible change despite possessing the potential—just as ice does not melt until it is warmed to 0 degrees.

Third Principle (How Interaction Brings the Potential to Fruition):
An object’s potential is realised through molecular collisions and interactions with another object.

When an object with greater motion (a hotter one) is placed next to an object with less motion (a colder one), the molecules in the warm object “share” their energy with those in the cold object through a chain of collisions. No heat-fluid is transferred.

This process is like Newton’s cradle: energy passes from one particle to the next without the particles themselves moving from place to place, bringing the kinetic potential of successive particles to fruition, one by one.

The chain continues until the potential of all the molecules in both objects reaches the same degree of realisation (thermal equilibrium) and the energy difference disappears.

Fourth Principle (The Limits of Spontaneous Realisation):
The realisation of potential is always directed from the pole where it is more fully realised towards the pole where it remains latent (the second law of thermodynamics).

In other words, a cold object cannot spontaneously impart its latent potential to a hot one. But if we supply energy to the system from outside—as with a heat pump or refrigerator—we can reverse this process and make thermal potential flow in the opposite direction. In doing so, by expending external work, we can bring the potential of the cold object to an even fuller expression.

Fifth Principle (A Final Philosophical and Physical Perspective):
Heat is not an external gift, but the awakening of an inner capacity.

From a purely physical perspective, energy is imposed on matter from outside, warming it.

From a philosophical perspective, cold is the state in which the potential for motion is restrained and dormant, while heat is its release and manifestation. Thus, when an object warms, the “veil of cold” is lifted from the face of its dynamic essence, revealing its ever-present potential.

Final Summary:
Matter is inherently and perpetually endowed with the potential for motion and activity, but this potential remains dormant and still until external conditions—a suitable structure and the attainment of an energy threshold—are in place. When matter comes into contact with a more energetic source, this potential is realised through a chain of molecular collisions, like Newton’s cradle, and kinetic energy spreads throughout the object. Although this process naturally proceeds from hot to cold, it can be reversed through intervention and the expenditure of external energy. Ultimately, warming an object does not create a new phenomenon; it awakens and brings into actuality the very dynamism that has been woven into matter from the beginning.