Conduction

1. Setup: Place one end of each rod into a beaker of boiling water. Attach thermometers at the other end of each rod, ensuring they are equidistant from the hot end.
2. Procedure: Record the initial temperature of each thermometer. Monitor the temperature increase of each thermometer over a fixed time period (

1. A good thermal conductor should allow heat to transfer through it quickly.
2. A good thermal conductor should have a low specific heat capacity, meaning it requires less energy to change its temperature.

Thermal conduction in metals occurs through two main mechanisms:

1. Atomic/Molecular Lattice Vibrations: When one end of the rod is heated, the atoms at that end vibrate more vigorously. These vibrations are passed on to neighboring atoms in the lattice, transferring thermal energy along the rod. The increased kinetic energy of atoms at the hot end is thus propagated as a wave of vibrations.

2. Movement of Free (Delocalised) Electrons: Metals contain many free electrons. These electrons gain kinetic energy from the heated end and move randomly throughout the metal lattice. As they move, they collide with atoms and ions in the lattice, transferring energy to them. This is a much faster and more efficient process than lattice vibrations alone, especially in good conductors.

In non-metallic solids, thermal conduction primarily occurs through atomic or molecular lattice vibrations. Unlike metals, non-metallic solids have very few or no free (delocalized) electrons. Therefore, the dominant mechanism is the transfer of kinetic energy through vibrations of the atoms or molecules within the solid lattice. The rate of transfer is generally lower than in metals due to the absence of the free electron contribution.

Thermal conduction in gases is poor because the particles (atoms or molecules) are widely spaced. This means there are fewer collisions between particles to transfer kinetic energy (heat). The particles also move randomly and at lower speeds compared to solids, further reducing the rate of energy transfer. Therefore, the rate of transfer of thermal energy is slow.

In a gas, particles are widely spaced and move randomly. The intermolecular forces between gas particles are very weak or negligible. This arrangement leads to infrequent collisions between particles. Because the particles are far apart and don't interact strongly, the transfer of thermal energy (kinetic energy from particle to particle) through collisions is slow and inefficient, resulting in poor thermal conduction.

Copper has free electrons like silver, which can move through the structure and transfer thermal energy quickly. However, silver has a higher density of these free electrons and a more ordered crystal lattice structure, allowing for more efficient energy transfer. Wood, being a non-metal, has very few free electrons and a less ordered structure, making it a poor conductor of thermal energy.

1. Steel
2. Glass

These materials conduct heat more readily than wool because they have some free electrons or a more structured arrangement of atoms, allowing for easier energy transfer than wool's insulating air pockets, but not as efficiently as aluminium's highly mobile free electrons.