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Understanding Heat Transfer: Conduction, Convection, and Radiation

Dive into the principles of heat transfer through direct contact in conductors like metals, insulators such as wood and plastic, and the fluid dynamics of convection. Unravel the mysteries of thermodynamics, exploring energy conversions, the laws governing thermal energy, and the pursuit of reaching Absolute Zero. Discover how heat flows through different mediums and learn about the crucial roles played by conduction, convection, and radiation in various everyday and scientific contexts.

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Understanding Heat Transfer: Conduction, Convection, and Radiation

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  1. Ch. 16 Sec. 2 Heat and Thermodynamics

  2. Transfer of thermal energy through direct contact Conductors – metals Insulators – wood, plastic, fiberglass, styrofoam, air, etc. Conduction

  3. Convection • Convection – transfer of heat in a fluid that creates currents due to differences in temp. • Ex. Weather, force-air heating systems, etc.

  4. transfer of energy by EM waves. Ex. Sun, fireplace, etc. Radiation

  5. Thermodynamics • Study of conversions between heat and other forms of energy • Heat and work increase thermal energy. • 1st Law: Thermal energy system = work done on a system + heat transferred. • Energy is conserved • 2nd Law: It is impossible for heat to flow from a cool object to a warm object unless work is done.

  6. 1st Law of Thermodynamics • Typical thermodynamic system, showing input from a heat source (boiler) on the left and output to a heat sink (condenser) on the right. Work is extracted, in this case by a series of pistons.

  7. 2nd Law

  8. Thermodynamics • 3rd Law • Absolute Zero cannot be reached: 0 Kelvin • Scientists can almost reach absolute zero

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