Understanding Heat Transfer Without Particle Motion

Heat can be transferred from one place to another through three main processes: conduction, convection, and radiation. The question asks about the specific process where heat moves from one particle to another within a body without the particles themselves physically moving from their positions. Let's look at each option:

• Conduction: This is the transfer of heat through direct contact. In solids, heat is transferred primarily by the vibration of atoms and molecules, and the collision of free electrons. The particles themselves do not move from one place to another within the material, but they pass energy to their neighbors through these vibrations and collisions. This process fits the description given in the question perfectly.
• Convection: This process involves the transfer of heat through the actual movement of a fluid (liquid or gas). Warmer, less dense parts of the fluid rise, while cooler, denser parts sink, creating convection currents that transfer heat. This involves the physical motion of particles, so it does not match the question's description.
• Radiation: This is the transfer of heat through electromagnetic waves, such as infrared radiation. It does not require any medium (solid, liquid, or gas) for heat transfer and does not involve the movement of particles within a body. While it doesn't involve particle motion *of the body transferring heat*, the description "from one particle of the body to another" implies a mechanism *within* the material, which radiation doesn't directly describe for internal heat transfer in this context.

Based on the definitions, the process of heat transfer from one particle of a body to another without the actual motion of the particles is known as conduction.