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Exploring Thermal Energy Transfer: Conduction, Convection, and Radiation

Dive into the fascinating world of thermal energy transfer through conduction, convection, and radiation processes. Uncover how kinetic energy manifests in the movement of particles and learn how heat is transferred across substances. Witness demonstrations illustrating these methods and understand how thermal energy is absorbed, reflected, and passed through matter and space. Discover the principles behind each process and enhance your knowledge of energy transfer sciences.

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Exploring Thermal Energy Transfer: Conduction, Convection, and Radiation

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  1. Transfer of Energy Sciences 7e Mme. Goold

  2. Kinetic Energy • Kinetic energy is the energy of movement inside an object. • In the case of thermal energy, it’s the energy of the vibration of the particles.

  3. Transfer of thermal energy (heat!) • Heat is transfered from a warm substance to a cooler one. • There are three processes • Conduction • Convection • Radiation

  4. Conduction • The particles near the source of heat absorb energy and start to move faster. • The particles that move faster start bumping against other particles, increasing their energy and speeding up their movement.

  5. Conduction • Particles continue to hit one another and so on and so forth. Thermal energy is transfered across the substance. • Youtube - conduction

  6. Conduction

  7. Conduction • Demonstration – Nails on a stick

  8. Convection • Particles close to the source of heat absorb energy and get warmer. • Particles that are hotter are futher apart (less dense) and therefore they rise.

  9. Convection • Cold particles are closer together (more densely packed) and therefore they sink to the bottom and become reheated. • Eureka! Convection • Demonstration – Smoke Stack

  10. Radiation • Thermal energy is transfered from the source of heat in the form of a wave. • The wave can pass through matter and even through space.

  11. Radiation • Thermal energy is either absorbed or reflected by objects that are in the path of the wave. • This is done WITHOUT particles • Eureka! Radiation • Demonstration (lightbulb)

  12. Three methods of energy transfer

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