Slide 2: Conduction involves objects in direct contact . This transfer of heat energy happens when particles within a substance collide or when two objects come in contact . Some substances conduct heat better than others Solids conduct heat better than liquids Liquids conduct heat better than gases . Poor conductors of heat are called insulators . Heat is transferred from an area of higher temperature to an area of lower temperature. For example, if a plastic spoon and a metal spoon are placed into a hot liquid, the handle of the metal spoon will get hot quicker than the handle of the plastic spoon because the heat is conducted through the metal spoon better than through the plastic spoon.
Slide 3: Convection is the transfer of energy as heat by movement of fluids . (Fluids are either liquids or gases.) In convection, particles with higher energy move from one location to another carrying their energy with them. Heat transfer occurs when particles with higher energy move from warmer to cooler parts of the fluid. Uneven heating can result in convection, both in the air and in water. This causes wind and ocean currents .
Slide 4: Radiation is the transfer of energy through space without particles of matter colliding or moving to transfer the energy. This radiated energy warms an object when it is absorbed. Radiant heat energy moves from an area of higher temperature to an area of cooler temperature.