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Heat Transfer

Heat Transfer. Conduction Convection Radiation. Con du ct ion. Conduction. Energy is transferred from molecule to molecule as they collide Solids are best at transferring heat by conduction Heat is moves from hot to cold. Fast (hot) atoms bump into slow (cold) atoms

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Heat Transfer

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  1. Heat Transfer Conduction Convection Radiation

  2. Conduction

  3. Conduction • Energy is transferred from molecule to molecule as they collide • Solids are best at transferring heat by conduction • Heat is moves from hot to cold

  4. Fast (hot) atoms bump into slow (cold) atoms • Fast atoms make slower atoms speed up • Kinetic energy (energy of motion) is transferred from hot to cold • Temperature is a measure of average kinetic energy

  5. Convection • Transfer of heat energy by movement in fluids (liquids and gases) • Warmer region of fluid expands and becomes less dense

  6. Convection • Less dense , warmer material rises, more dense, cooler material sinks • Convection currents form

  7. Radiation • Transfer of electromagnetic energy through space • Electromagnetic energy is energy in light • Light travels through space as a wave

  8. Forms of Electromagnetic Energy • Radio waves • Microwaves • Infrared (heat) • Visible light • UV • X-rays • Gamma rays

  9. Characteristics of electromagnetic radiation • Travels through space at 186,000 miles per second • Each form has a different wavelength, frequency and energy • Higher frequency has more energy

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