Conceptual Physics Alive: Heat Transfer includes a digital video and questions set with answers.

Conduction is related to many everyday examples and is demonstrated by boiling water under a variety of conditions. Convection is shown with a pressure cooker. Radiation is related to Newton's law of cooling. Segment length: 45 minutes

Heat Transfer Includes:

• Hewitt begins by heating a metal ring with a torch to see the effect on the hole size. The hole gets larger, which answers the homework (Next-Time Question) of the previous lecture.
• Chalkboard explanation is given of the increase in hole size.
• Demonstration of heating a bimetallic strip. Its application is the thermostat.
• The wooden handle of the bimetallic strip and poor heat conduction.
• Conductors and the presence of loose electrons about atomic nuclei.
• Wood is a poor conductor at any temperature, whether in a hot oven or as red-hot coals.
• Walking barefoot on red hot coals without harm is explained.
• The conductivity of chairs in the classroom compared by students.
• Demonstration of wrapped paper around a piece of iron in a hot flame
• Why the paper doesn't light on fire.
• Demonstration repeated with paper wrapped around wood.
• Demonstration of water in a paper cup held in the flame.
• Demonstration of poor heat conductivity of water. An ice cube wedged at the bottom of a test tube filled with water is held in a flame, to show that the water at the top of the tube boils while the ice cube remains intact.
• Water's poor conductivity and the constant 4C water that remains at the bottom of deep lakes that have high-temperature surfaces.
• Poor conductivity of air, with examples of down-filled sleeping bags, the fur of animals, Styrofoam, spun glass, and thermal underwear.
• Convection, and why warm air rises.
• Helium atoms and their rise in the atmosphere.
• The expansion of rising warm air and cooling.
• Student demonstration of cooling by blowing on hands.
• Demonstration of hand in the path of expanding steam from a pressure cooker.
• Explanation of why air cools when it expands.
• Radiation.
• Frequency and temperature relations or radiation.
• Wave motion simulated by shaking an imaginary rubber tube.
• The greenhouse effect and its explanation.

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