Conceptual Physics Alive: Heat: Change of Phase includes a digital video and questions set with answers.

Observe Paul Hewitt teach in a classroom with real students, using engaging demonstrations and artwork. In this video, the concepts of evaporation and condensation are contrasted. The energy transfer that accompanies changes of state is related to everyday examples. Segment length: 46 minutes

Heat: Change of Phase Includes:

• Evaporation is introduced with a skit about massaging with alcohol.
• Graph of molecules versus relative numbers of molecules in a container of water.
• Evaporation and molecular speed.
• Example of evaporation: Indian child keeping a jug of water cool.
• Examples of cooling by evaporation: dogs panting, pigs wallowing in the mud, people perspiring.
• Hewitt's experience in a hot tub where evaporation was prevented and overheating of the body, rather than cooling, occurred.
• Boiling and cooling.
• Hewitt shows a pressure cooker and explains how boiling and therefore cooling is prevented via a chalkboard diagram.
• Hewitt tells of the exhibit at the Exploratorium In San Francisco that freezes water by boiling in a vacuum.
• The physics of cooking spaghetti.
• Low-temperature boiling at high altitude.
• Condensation, the opposite of evaporation, and a warming process.
• Remaining in a shower and muggy days.
• How air warms when condensation occurs.
• Energy changes with change of state.
• Why water in a farmer's canning cellar doesn't freeze m subzero temperatures.
• Why a steam burn is more damaging than a boiling water burn.
• How air conditioners work by change of phase.
• Condensation examples: shapes of drinking glasses, napkins beneath cold drinks, water rings from ice-cold drinks on a surface, the moisture inside a parked car, clouds in the sky. Hewitt humorously relates all these to CH (Condensation Honey!)
• Why clouds form over mountains.
• Why clouds form over Islands with no mountains.
• Cooling of expanding air, and warming by compression.
• Cooling of rising air by 10 degrees for every 1 km increase in elevation.

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